[JiaYu S3 ROMs, Kernels, Recoveries, & Other Develo] fire855:
Changelogs:

Build [7.0] 20160826 - Beta 1

First Release

Build [7.0] 20160827 - Beta 2

Fixed Camera

Fixed FMRadio

Fixed NFC

Added buttons and more notification settings

Added M.A.D. extras (fastcharge, smartwake, performance settings, sensor tool)

Build [7.0] 20160904 - Beta 3

Fixed Hardware decoder/encoder

Fixed Sound / Mediaserver issues

Fixed Video recording

Fixed GPS

Cleaned up apps & added proper browser

Other system issues fixed and improvements here and there

Build [7.0] 20160910 -Stable 1

Updated to 7.0.0_r6 (security patch level: September 6)

Updated kernel version to 3.10.103

Fixed GPS issues

Fixed sensor calibration

Fixed data usage monitor

Fixed data saver

Fixed other small issues

Build [7.0] 20160917 -Stable 2

Fixed FMRadio issues (volume control, recording)

Fixed sensor calibration

Fixed wifi issues (5ghz wifi hotspot)

Fixed DRM issues

Updated apns

Switched to new audio policy configs

Build [7.0] 20160927 -Stable 3

Reworked M.A.D. settings (fixed various problems)

Fixed HDR camera mode

Added Snap Camera app

Added standalone file manager

Added sim on/off switch

Added signal bar color option

Added custom headphone control (3 buttons: the right and the left one (normally only for volume) can switch now between tracks with a longer click)

Various other changes including fixes for gapps

Build [7.0] 20161016 -Stable 4

Fixed some RIL issues (airplane mode, sim activation)

Fixed some wifi issues

Fixed some audio problems (e.g. whatsapp audio recording)

Improved compatibility between snap camera and mtk

Fixed video recording issues (e.g. Snapchat video recording)

Enabled and fixed automatic night mode

Added ambiet display (including settings part)

Added substratum support

Fixed & reworked some other things (e.g. improvements)

Built as user build (no su binary)

Build [7.1] 20161030 -Stable 5

Updated to latest Nougat: 7.1 [ NDE63P ]

Dual ringtone (choose a ringtone per SIM)

Improved sim switch

Enabled 'Night Light' feature of Android 7.1 (automatic mode not finished by Google yet)

Updated apps (Calendar, Gallery2, Gello)

New bootanimation

Some small other changes

Build [7.1] 20161113 -Stable 6

Updated to NDE63X (security patch level: 6th November)

Kernel upstream (3.10.104)

Enforcing SELinux

Various other security improvements

Improved camera recording

Updated bluetooth system

Added partial screenshot feature (long press on screenshot in power menu)

Added Gesture settings

Improved sim switch

Fixed flashlight tile

Various other improvements

Build [7.1] 20161205 -Stable 7

First signed build (fixes for example android wear app)

Fixed some codec issues

Fixed 'prevent audio ducking'

Fixed theming of 'button settings'

Fixed clock app crashes

Fixed default call sim setting

Added 'kill foreground app on longpress' in button settings

Added Russian translations by Borizzz

Various other improvements

Build [7.1.1] 20161210 -Stable 8

Updated to Android 7.1.1

Fixed FMRadio

Fixed led notification for missed calls

Improved substratum support (OMS7)

Various other improvements

Build [7.1.1] 20170106 -Stable 9

Updated to N4F26M (7.1.1)

Security patch level: 5th January 2017

Added long-press power for toggling torch feature

Added option to control scroll friction and velocity

Added PixelUI navbar

Added 'longpress button, to kill foreground app'

Merged security patches

Other small improvements

Build [7.1.1] 20170224 -Stable 10

Updated to 7.1.1 r22 ( NMF26X )

Security patch level: February 5, 2017

Updated kernel to 3.10.105

Added many new M.A.D. extras

Improved LED custom Settings

Improved Tethering

Improved hall sensor support ( flip cover )

Improved media HW decoding & encoding

Camera: Improvements on default app ( Snap )

Update System Sounds (ringtones, etc)

Added new MAD offline charging animation

Added new Russian Translations (thanks to Borizzz)

Build madOS v1.1 [7.1.2] 20170527

Update to 7.1.2

Patch Level: May 2017

madOS version v1.1

Introducing:

madlauncher: (AOSP based, but on mad steroids with several options)

madCamera: Our own camera (with several improvements for MediaTek based devices)

Telephony :

RIL improvements

Fixed a badass NullPointer on Telephony (Operator related)

Network / SIM Status fixes

wlan and connection improvements

Added sdcardfs support

Support for the new substratum (madOS is now an official supported rom)

Other Features:

omnijaws weather (Lockscreen & Status bar,etc)

--> with huge madOS improvements over the original implementations

Power Menu Options

One handed mode

Lockscreen PIN quick unlock & quick unlock improvements

Added SIP Options

QS (Quick Settings) Options

Custom Carrier Label options

madOS NavBar: fixup

Bluetooth: battery status options

AlarmsBlocker

WakelockBlocker

Recents Options

Pie: New SlimPie (ported by mad from lp to N) & improved

Tiles:

CompassTile

NFC Tile

Compass & Language toggle Tiles

madOS Tile

etc ..

Other fixes & Improvements:

couple GAPPS related issues

location provider errors

SchedulePowerOnOff

facelock

Removed Gello , Welcome chromium

faster app switching

AppOps

gesture events

PhoneWindowManager

anr's

NPE's

memory leaks

masOS offline charging animation

Dashboard & madOS settings cleanup

Miracast issues on some dongles

There's other fixes & features included on this release

--> Too much to write on a changelog

Build madOS v1.2 [7.1.2] 20170819

Patch Level: August 2017

Kernel version 3.18.64

Fixed video recording issues

Fixed substratum issues

New feature for showing charging current & voltage on lockscreen

Added F2FS support

Reworked MTK RIL implementation

Some more improvements