[Online Courses, Schools, and Other External Resour] coolsandie:
From ... R - Z

Radar - By Mike Cleron

Invoke this activity from your app to display a radar view. This will draw a bearing between the user's current location and the specified latitude and longitude.

Source - Google Code

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Random RGB Live Wallpaper - By luzi82

A live wallpaper to generate random color pixel on screen.

Source - Github

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RateBeer for Android - By 2312 development

Mobile interface to the world's largest source for information on craft beer: RateBeer

Source - Google Code

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Reddit Headlines for DashClock - By Trolldad

Reddit Headlines for DashClock will display top stories from the subreddit of your preference on your DashClock widget or daydream.

Source - Github

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RedPhone Beta - By Thoughtcrime Labs

RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in.

Source - Github

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Root Verifier - By Madhav Kanbur

This application is a simple app which checks if your Android device has Superuser access ("root") or not.

XDA Thread - [Android 2.2+]Root Verifier[Checks Root & Busybox]

Source - Github

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RoundR - By Mohammad Adib

RoundR serves a simple purpose; To round the corners of your screen.

XDA Thread - [APP][2.1+] RoundR - Rounded screen corners

Source - Github

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Rotation Lock Open Source - By Peng Huang

Turn on/off Auto-rotate screen quickly by long pressing search button.

Source - Github

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SambaDroid - By Berserker

SambaDroid is a native port for Android of the popular Samba for Linux. ROOT REQUIRED

XDA Thread - [APP][2.2+]SambaDroid

Source - Github

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Sanity - By Cristiano Tagliamonte

Sanity makes your phone calls better, easier and healthy.

Source - Github

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Search based launcher v2 - By Ideas from brain

Effective & simple & open source with minimalistic appearance.

XDA Thread - [app 2.1+] Search based launcher - open source

Source - Github

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Secrecy -Encrypt Files - By Doplgangr

Secrecy helps you encrypts your important private files. We only have one mission statement: delivering privacy at the touch.

XDA Thread - [App][2.3+][OPEN SOURCE] Secrecy - encrypt your files

Source - Github

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Send To Car - By Julien Vanier

This app lets you send an address from Google Maps directly to the navigation system of your vehicle so you don't have to manually type it in.

Source - Sourceforge

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Send With FTP - By Michael Totschnig

Send With FTP responds to two intents for sharing files through FTP: 1) android.intent.action.SEND 2) android.intent.action.SENDTO

Source - Github

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Seven+ WP7 Calculator - By Thomas Barrasso

nspired by the beauty and simplicity of the Metro User Interface/ Microsoft Windows Phone 7 (WP7), The Seven+ WP7 Calculator offers an easy to use, effective alternative to the default Android calculator application.

XDA Thread - The Seven+ Calculator

Source - Github

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Share By QRCode - By Intrications

Share web addresses by QRCode from the Browser or YouTube app.

Source - Google Code

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Shelves - By Garen J Torikian

Shelves is an Android application that manages your collection of apparel, board games, books, comics, gadgets, movies, music, software, tools, toys, and video games.

Source - Github

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Shoppinglist (Open Source) - By Lennart Prelle

Shoppinglist is an open source app on Android to store all your items you wan't to buy.

Source - Github

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SidePanel - By 한영빈

Swipe From Edge! and easily switch between running tasks.

XDA Thread - [APP][2.2+][BETA]SidePanel - Swipe from Edge to multitask

Source - Github

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Simon Tatham's Puzzles - By Chris Boyle

Collection of 34 one-player open-source multi-OS puzzle games.

Source - Website

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Simple C25K - By Roel Blaauwgeers

Simple C25K is a very simple, free and open source application that can be used to follow Josh Clark's famous 'Couch to 5k' running plan.

Source - Github

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Simple Explorer - By DF1E

File Manager designed in Holo Style.

Source - Github

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Simple Loan Calculator - By Andrei Samkov

The Simple calculator for annuity, differentiated and fixed payments.

Source - Google Code

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SKU Kernel [Any Root Device] - By Lounge Katt

StarKissed Universal Kernel Remote was developed to offer a single universal platform to configure kernels without charging the price of a pack of cigarettes.

Source? - XDA Thread

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SlidingMenu Demos - By Jeremy Feinstein

SlidingMenu is an Open Source Android library that allows developers to easily create applications with sliding menus like those made popular in the Google+, YouTube, and Facebook apps.

Source - Github

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SLW App History Widget - By Christian Schneider

A (s)imple, (l)ight(w)eight app history widget, that displays the recently used apps in a widget.

Source - Google Code

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SLW Audio Volume Widget - By Christian Schneider

A (s)imple, (l)ight(w)eight audio volume widget. It lets you set the volume of different audio streams with just a widget.

Source - Google Code

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SLW Battery Widget - By Christian Schneider

The widget displays battery level in percent. No ads. No permissions.

Source - Google Code

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SLW Cache Cleaner Widget - By Christian Schneider

It helps you to clear all application cache files with only one touch on the widget.

Source - Google Code

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SLW Cpu Widget - By Christian Schneider

A (s)imple, (l)ight(w)eight cpu widget, that displays cpu load without the need of any permission. No ads.

Source - Google Code

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SLW Gps Widget - By Christian Schneider

A (s)imple, (l)ight(w)eight gps widget. It shows Latitude, altitude(as soon there is a GPS fix available) and Longitude in the top line.

Source - Google Code

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SLW Storage Widget - By Christian Schneider

A (s)imple, (l)ight(w)eight, storage widget. It displays free storage space available on SD card on the left and free internal memory on the right.

Source - Google Code

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SLW Traffic Meter Widget - By Christian Schneider

A (s)imple, (l)ightweight, network traffic counter widget. It displays network traffic without the need of any permission. No ads.

Source - Google Code

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SLW Wifi Scan Widget - By Christian Schneider

A (s)imple, (l)ight(w)eight, wlan / wifi scanner widget. It displays the wlan / wifi networks in your neighborhood.

Source - Google Code

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Solar Collector (Sky Map) - By Paradise Android

In "Solar Collector" you need to harvest solar energy with your phone.

Source - Google Code

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SongMemo - By JoaoSantacruz

SongMemo is a multitrack audio recorder (4 track like) for the Android platform.

Source - Github

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Spark 360 - By Akop Karapetyan

Spark 360 is a full-featured, unofficial Xbox Live and PlayStation Network client for Android devices.

Source - Google Code

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Sparse rss - By Stefan Handschuh

A very simple open source (MIT license) RSS reader.

Source - Google Code

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Spy Camera OS (Open Source) - By Jimmy Halim

Everyone at one time will want to capture image without anyone notice it, this application will give you an easy, fast and smart way doing it.

XDA Thread - Spy Camera OS (Open Source)

Source - Bitbucket

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S Tools+ - By Naman14

S Tools+ is a pack of 5 different useful tools for your device.

XDA Thread - [App][Material Design] [Open Source]S Tools+

Source - Github

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Superuser - By ClockworkMod

Grant and manage Superuser rights for your phone.

Source - Github

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SwiP - ProfileSwitcher - By FortyTwoBits

SwiP - Switch profiles intelligently. SwiP is an intelligent profile app for Android.

XDA Thread - [APP][4.0+] SwiP - Switch profiles intelligently

Source - BitBucket

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Target Live Wallpaper - By PuZZleDucK Industries.

Simple touch tracking live wallpaper. Tracks touch gestures and renders a targets, many options

XDA Thread - [App] Target Live Wallpaper Open Source

Source - Google Code

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Tea Timer - By Ralph Gootee

A simple tea timer, works when the phone is sleeping. Can even be used to time things _other_ than tea!

Source - Github

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Ted (Text Editor) - By Xavier Gouchet

Ted is an Open Source, Ad-free, lightweight text editor, meant as a Notepad application, and not meant to edit big files.

Source - Github

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Telegram - By Telegram LLC

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

XDA Thread - [APP][2.1+] Telegram, the secure chat client

Source - Website

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TextSecure Beta - By Thoughtcrime Labs

TextSecure is a security enhanced text messaging application that serves as a full replacement for the default text messaging application.

Source - Github

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Timer - By Sarasini Francesco

Open Source Stopwatch Application.

Source - Website

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Timetable - School Scheduler - By Ravrahn

Timetable is an easy way of keeping track of your high school or college classes. It does one simple thing - stores a high school timetable and displays it.

XDA Thread - [APP][1.6+]Timetable

Source - Bitbucket

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Tiny File Commander - By Christian Schneider

Tiny File Commander is a very small (130Kb), very fast ad free file manager with beautiful icons.

Source - Google Code

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Tiny Open Source Violin - By Martyn Haigh

Currently has a choice of 3 classic songs (louder by popular request), or you can now also pick your own song!!

Source - Github

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Tippy Tipper (Tip Calculator) - By Mandaria Software

A simple and open source Tip Calculator.

Source - Google Code

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toggleheadset2 - By ddubtech.com

This is an open source project originally intended for use with the now legacy Android 1.6 (donut) release and 3.5mm headphone jack HTC multi adapters on the G1 due to android issue 2534.

Source - Google Code

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Tomdroid notes - By Olivier Bilodeau

A Tomboy client for Android. Tomboy is a desktop note-taking app using a wikiwiki approach and a simple user interface.

Source - Launchpad

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Torch - By Colin McDonough

Torch is an open source utility which uses your phones LED camera flash as an LED flashlight.

Source - Google Code

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Torch LED Flashlight - By Colin McDonough

Torch is an open source utility which uses your device's LED camera flash as an LED flashlight.

Source - Google Code

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Tram Hunter - By Andy Botting

Android client to Yarra Trams tram TRACKER® service for real-time location of Melbourne trams, Open Source under the GPLv3 license.

Source - Github

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ttTumblr - By Fredrik Leijon

Tumblr application, supports viewing dashboard, posting images, text, link, conversation and quote entries.

Source - Github

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Twidere for Twitter - By mariotaku

Twidere is a powerful Twitter and Identi.ca (Use basic auth) client for Android 1.6+, which gives you a full Holo theme and much more.

Source - Github

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Twidere Imgur Uploader - By mariotaku

Twidere Imgur Uploader

Source - Github

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Ultimate Stopwatch & Timer - By geekyouup

Beautifully designed Stopwatch and Countdown timer for Android phones, tablets and TVs. Ticking Sound, Countdown Alarm and Lap Time functionality

Source - Google Code

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Ultra Explorer - By kshark27

Opensource Explorer for Android

Source - Github

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User Management - By Appaholics

User Management provides a nice GUI frontend to use the limited multi user support added in Android 4.1 Jellybean

Source - Github

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vCardIO - By Duck Tayp

vCardIO is an open-source utility to import/export contacts from/to a vCard (vcf) file on the SD card.

Source - Google Code

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Veloid - By xirgonium

Application for bike sharing users

Source - Google Code

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Ventriloid - By jtxdriggers

Ventriloid is an open source Ventrilo 3.x client with a familiar UI. Ventriloid is based on the Ventrilo library for Linux created by the developers of Mangler.

Source - Google Code

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Vibe Vault - By Andrew Pearson and Sanders DeNardi

Vibe Vault is the best way to stream and download FREE live music from your phone.

Source - Website

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Vim Touch - By momodalo

VimTouch is a open source VIM port on Android. It supports full vim syntax and finger touch gestures to help VIM much more usable on touch screens.

Source - Github

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VLC for Android Beta - By VideoLabs

VLC media player is a free and open source cross-platform multimedia player that plays most multimedia files as well as discs, devices, and network streaming protocols.

Source - Website

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WebSMS - By Felix Bechstein

WebSMS lets you send free and very cheap TXT/SMS via different webservices.

Source - Google Code

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Weight Chart - By fredrik.jemla.eu

Keep a log of your body weight and display on a chart.

Source - Website

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Widgets Everywhere - By sak-venom1997

Keeping widgets just in your home screen sort of adds a limit to there functionality.With this app, you can put an end to the limit.

Source - Github

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Wifi Connecter Library - By farproc

An OPEN SOURCE library which allows you to connect to Wi-Fi hotspots.

Source - Google Code

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Wifi Fixer - By Zanshin-g1

Wifi Fixer is a low-resource service that works around several problems with Android wifi. It is primarily intended for users whose wifi shows as connected, but cannot use internet applications.

Source - Github

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WifiSync - By Michael Kanis

WifiSync automatically enables/disables the Auto-sync setting of your phone when WLAN gets connected/disconnected.

Source - Github

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Wikipedia - By Wikimedia Foundation

Official Wikipedia App for Android.

Source - Github

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Wiktionary - By Wikimedia Foundation

Wiktionary is a web-based dictionary that anyone can edit, available in over 150 languages.

Source - Github

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World Map - By sigseg, llc

WorldMap is a simple Android app that displays a map of the world taken from Wikimedia, and allows the user to scroll around on it.

Source - Github

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Wunder - By Smerty Software

This is NOT a general weather app, it is an open source app to view current weather from personal weather stations on Weather Underground.

Source - Github

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Yaaic - By Sebastian Kaspari

Yaaic (Yet Another Android IRC Client) is an Internet Relay Chat (IRC) client.

Source - Github

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Yet Another Auto Brightness - By Gyrus Solutions

A small application designed to enhance user control over screen brightness. Initially it was developed to make the screen as dim as possible to save battery.

XDA Thread - [APP][2.2+][FREE] Yet Another Auto Brightness

Source - Bitbucket

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YouTube Downloader - By xda_dentex

Simply select the sharing button in the YouTube App while watching a video (or share any YouTube plain text link via any App; i.e. browser) and choose "YouTube downloader"

Source - Github | Sourceforge

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ZooBorns - By Smerty Software

Open Source client to view photos from ZooBorns.com

Source - Github

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2cloud - By Second Bit

The 2cloud Project's Android client. Sends links from your Android phone to your browser instantly.

Source - Github