[Windows RT Development and Hacking] GoodDayToDie:
Apps which have been recompiled:

Bochs. x86 Emulator. Known issue: no network support. http://xdaforums.com/attachment.php?attachmentid=1625048&d=1357575232

TightVNC. VNC server and client. http://xdaforums.com/attachment.php?attachmentid=1624600&d=1357561475

PuTTY Suite. SSH/Rsh/telnet client and helpers. Printing fixed in this build. http://xdaforums.com/attachment.php?attachmentid=1637160&d=1357948281

7-Zip. Utility for file archives and disk images. https://mega.co.nz/#!FhQV3SZA!MWayY1mV4b7Bvjs9nJNq_yiQxDEaJFQpnnA3ZNApq7g

Notepad++. Powerful but simple text/code editor New update and Compare plugin. http://xdaforums.com/showthread.php?t=2556112

SciTE. Code editor (http://www.scintilla.org/SciTE.html). http://fearthecowboy.com/stuff/wscite.zip (Thanks to XDA-Devs member FearTheCowboy)

IP Messenger. Peer-to-peer chat/file transfer (http://ipmsg.org/index.html.en). Binaries at http://xdaforums.com/attachment.php?attachmentid=1633711&d=1357842066, source at http://xdaforums.com/attachment.php?attachmentid=1633715&d=1357842310

Unikey 3.6. Known issue: without RtfIO, the "Toolkit" and "Conversion on the fly" features won't work. Older 3.1 build posted below https://dl.dropbox.com/u/8557161/rt/unikeyNT3.62_arm.7z (Thanks minhtuan99bk)

CrystalBoy. Nintendo Gameboy emulator. Known issue: uses GDI+ instead of DirectX, may reduce performance. Conflicting reports as to whether it works. http://sdrv.ms/11kcXXL Thanks to DXA-Developers member daveoggy.

ClassicStartMenu. Provides a hierarchical Start menu on the desktop taskbar. Restart Explorer after you run it! http://xdaforums.com/attachment.php?attachmentid=1640579&d=1358061318 (Thanks Netham45).

Quake 2. First-person shooter game. http://xdaforums.com/attachment.php?attachmentid=1640830&d=1358070370

OpenTTD. Open-source clone of Transport Tycoon Deluxe (transportation simulation game). Known issues and download link HERE: http://xdaforums.com/showpost.php?p=36674868&postcount=151

DOSBox. DOS on x86 emulator. Updated again with better performance. http://xdaforums.com/showpost.php?p=36620852&postcount=117

Node.JS.: JavaScript program/web server execution environment. Will be slower than usual due to lack of v8 JIT. More info: http://xdaforums.com/showpost.php?p=36694633&postcount=1

FAR Manager. 2-panel terminal-based File/Archive manager (think Total Commander, etc.). Updated with plugins. http://xdaforums.com/showpost.php?p=36733772&postcount=1

Miranda IM. Multi-protocol chat/IM client. http://xdaforums.com/attachment.php?attachmentid=1649674&d=1358334467

Vim, GVim, etc. Code and text editor. Info and download links here: http://xdaforums.com/showthread.php?p=36930991

SumatraPDF. Document reader (PDFs, possibly some other formats). Read and download here: http://xdaforums.com/showthread.php?t=2098594

Audacity. Digital audio recording and editing. Info and downloads: http://xdaforums.com/showthread.php?t=2103779

VirtuaWin. Virtual desktop utility. http://xdaforums.com/showthread.php?t=2110131

Mini vMac. Emulator for very early Macintosh computers. http://xdaforums.com/attachment.php?attachmentid=1662947&d=1358737954

Rainmeter. Desktop customization / skinning tool. Many but not all features work: http://xdaforums.com/showpost.php?p=37018422&postcount=282

OpenSSL. Crypto tool, can generate keys and certificates. May have some issues with large ECC keys. http://xdaforums.com/showthread.php?t=2113595

MiKteX. LaTeX compiler (typesetting tool). Script is interpreted instead of JITed but works fine. http://xdaforums.com/showthread.php?t=2113634

Greenshot. Advanced screenshot tool. http://xdaforums.com/showthread.php?t=2114273

Iperf. Network performance testing tool. http://xdaforums.com/showthread.php?p=37346221#post37346221

MongoDB. NoSQL database. Mongo shell doesn't work correctly locally, but the server works and other clients should as well. http://xdaforums.com/showthread.php?p=37475852

ScummVM. Game platform for many older games. Known issues: many disabled features and some crashes reported in this early build. http://xdaforums.com/showpost.php?p=37583092&postcount=402

ResidualVM. Platform for many old-ish 3D games. Known issues: many disabled features, most engines don't work yet. More info and download: http://xdaforums.com/showpost.php?p=37632363&postcount=411

Superputty. Enhanced version of PuTTY Suite with more features. http://sdrv.ms/151FWzT (Thanks to Erwan12)

NZB-O-Matic. Newsgroup post downloader (NZB download tool). http://xdaforums.com/showpost.php?p=37886354&postcount=438

WabbitEMU. Texas Instruments graphing calculator emulator and dev tools. http://xdaforums.com/showpost.php?p=37928562&postcount=442

Regshot. Registry shapshot/comparison tool. http://xdaforums.com/showpost.php?p=37933687&postcount=1

CorsixTH. Engine for the game Theme Hospital. Includes demo, easy to use full version if you have it: http://xdaforums.com/showpost.php?p=38067653&postcount=466

FreeRA. Command & Conquer Red Alert (RTS game) engine. Requires game data files. http://xdaforums.com/showpost.php?p=38072727&postcount=468

FreeSynd. Syndicate (game) engine. No cutscene sound, requires game files. https://www.dropbox.com/s/ca0n0atmfl74306/Freesynd.zip

Pentagram. Ultima VIII (game) engine. Required game files. http://xdaforums.com/showpost.php?p=38295828&postcount=518

Free Download Manager. Standalone file downloader and bittorrent client. Has some known issues but works: http://xdaforums.com/showthread.php?t=2170002

PrBoom. DOOM game engine (can use the included shareware WAD file or other game files). http://xdaforums.com/showthread.php?t=2175449

ChocolateDuke3D. Duke Nukem 3D game engine. Requires game files. Has a known sound bug with workaround. http://xdaforums.com/showpost.php?p=38752618&postcount=561

GemRG. Infinity game engine clone (used for games like Baldur's Gate, Icewind Dale, and Planescape: Torment). Runs pretty well although some of the newer games may stutter a little. Requires the game files from a standard install. http://xdaforums.com/showthread.php?t=2177954

Process Hacker. Advanced process inspection / control tool similar to Sysinternals Process Monitor. Updated to 2.33! http://xdaforums.com/windows-8-rt/rt-development/app-processhacker-2-33-t2865384

FinalBurn Alpha. Arcade game emulator. Port is still considered "alpha" quality. http://xdaforums.com/showthread.php?t=2187370

SharpDevelop. C# IDE. Debugging is not yet supported and some setup work is required: http://xdaforums.com/showpost.php?p=39276938&postcount=615

MAME. Arcade machine emulator (requires ROMs). Not yet fully tested; performance issues reported with some games. http://xdaforums.com/showthread.php?t=2237754

WinDjVu. DjVu document viewer. http://xdaforums.com/showpost.php?p=40931011&postcount=687

MFPDemo. A desktop player for video files. http://xdaforums.com/showpost.php?p=40997441&postcount=691

Quake (original version) running in Direct3D (runs faster than the one that was listed here before). Instructions and downloads: http://xdaforums.com/showthread.php?t=2312019

ioQuake3 (Quake 3 Arena). Requires game files. Instructions and download: http://xdaforums.com/showpost.php?p=42338198&postcount=1

Coolplayer. Skinnable music player, now with FLAC support. Extra themes are available for download from the site. http://xdaforums.com/showthread.php?t=2318000

Synergy. Use one mouse and keyboard across PCs (including Linux & Mac). Now with 1.4.12 beta. http://xdaforums.com/showthread.php?p=37609926

Snes9x. Super Nintendo console emulator. Some features are disabled but games appear to work fine. http://xdaforums.com/showthread.php?t=2339228

FileZilla. Graphical file transfer program. No support for encrypted protocols in this build, only plain FTP. http://xdaforums.com/showthread.php?t=2340616

WinMerge. Diff(erencing) and merging tool. All features should work but this version is a little old; a newer one may come later. http://xdaforums.com/showthread.php?t=2340560

QuiteRSS. Stand-alone RSS feed reader with embedded browser. http://xdaforums.com/showthread.php?t=2355277

Single Player Game Transmitter client. Streams 3D apps with good quality and responsiveness. http://xdaforums.com/showthread.php?t=2355051

QupZilla. WebKit-based web browser. Uses interpreted JS. http://xdaforums.com/showthread.php?t=2353048

Lua. Scripting language, most commonly used for games. http://xdaforums.com/showthread.php?p=43808775

Halite. Nice BitTorrent client somewhat like uTorrent. Currently only includes English support. Magnet links may not work...? http://xdaforums.com/showthread.php?t=2372058

ffmpeg. Video player. May be very slow with some codecs. http://xdaforums.com/showthread.php?t=2368706

Fossil SCM. Distributed version control software (sort of like Git or Mercurial). http://xdaforums.com/showthread.php?t=2400099

Subversion. New update 1.8.5 with OpenSSL 1.0.1e. Widely used version control software. http://xdaforums.com/showthread.php?t=2494931

AutoHotKey. Keyboard macros and powerful automation of Windows functions. http://xdaforums.com/showthread.php?t=2408417

Paint.NET. Image manipulation program. http://xdaforums.com/showthread.php?t=2411497

Alien vs. Predator Classic. First-person games based on the movies. Requires game files. http://xdaforums.com/showthread.php?t=2414431

MicroEMACS. Small, EMACS-like text/code editor. Thanks to [MENTION=5159807]acrossland[/MENTION]! Binary available at Download link. https://bitbucket.org/adamcrossland/microemacs-for-surfacert

Nethack. The venerable and classic "roguelike" RPG. http://xdaforums.com/showthread.php?t=2576998

TeXStudio. IDE for LaTeX documents. Requires a compiler such as MiKteX (linked above). http://xdaforums.com/showthread.php?t=2493219

pForth. Interpreter for the Forth programming language. Docs and samples available as well as binary: http://xdaforums.com/showthread.php?p=51795065

Python 2.7.3. Programming/scripting language and runtime. New: Experimental FFI should make much more code work. (Thanks [MENTION=5065437]e13000[/MENTION]!) Runtime: http://xdaforums.com/showpost.php?p=50687352&postcount=921 LibFFI: https://drive.google.com/file/d/0ByNfJPIJQw6hRnlPMHM3b1FFUFU/edit?usp=sharing

Apps which run un-modified

Keepass Portable. Password storage wallet. http://downloads.sourceforge.net/keepass/KeePass-2.20.1.zip

Mouse Without Borders. Use one mouse across PCs (like Synergy). Install instructions here: http://xdaforums.com/showpost.php?p=36428923&postcount=258

Transmission.Net Remote. Remote control of a Transmission BitTorrent service. http://xdaforums.com/showthread.php?t=2101891

ShareX. Screen capture/upload utility. https://mega.co.nz/#!VxYVDZAS!KyyL8gGvjrcZWjEIOp3j_WnZqDsSucB_b3YcS0f-TbE

IceChat. IRC client. http://xdaforums.com/attachment.php?attachmentid=3221171&stc=1&d=1426912901

IKVM. Java, implemented in .NET (can run many pure-Java apps). http://www.ikvm.net/

Fiddler 4. Advanced HTTP proxy. To install, unpack the .EXE as an archive using 7-Zip. To run correctly, copy the file Microsoft.JScript.dll from \Windows\Microsoft.NET\Framework\v4.0.30319\ on a Win8 machine (older Windows versions may also work) to the Fiddler "install" (unpacked) directory. http://www.fiddler2.com/fiddler2/version.asp

Boxie. Multipurpose utility (image conversion, file management stuff, etc.). http://boxie.codeplex.com/ (Info: http://boxie.codeplex.com/documentation)

DtPad. Text/code editor. You can use the installer; there will be a warning but it's reported to work after clickthrough. http://dtpad.codeplex.com/

BoxWorld. Sokoban game. Extract the binaries from the installer using 7-Zip. http://boxworld.codeplex.com/

AstroGrep. Regular expression file/text search tool (basically, Unix grep). http://sourceforge.net/projects/astrogrep/

Notepad Enhanced. Simple text editor with tabbed interface. http://xdaforums.com/showpost.php?p=37370164&postcount=374 for info.

QuickSharp. C# IDE. Info at the same link as Notepad Enhanced, and also here: http://xdaforums.com/showpost.php?p=37385385&postcount=378

Remote TrackPad Server. Allows controlling a PC using a Windows Phone as a server. Use the.NET 4.5 server build: http://www.luecho.com/trackpad/

ImageGlass. Image viewing program. Runs fine but crashes on exit. https://github.com/d2phap/ImageGlass (Thanks igator)

Be.HexEditor. Simple editor capable of opening any file, including binary, and editing in text or hexadecimal. Requires changing a config file. http://xdaforums.com/showpost.php?p=39152904&postcount=611

WindowsAppBoss. Simplifies managing sideloaded or provisioned (i.e. not-from-the-store) Metro apps. http://windowsappboss.codeplex.com/

Perl 5.12.4. Popular scripting language, especially for working with strings. Official Microsoft-signed binary will run even without jailbreak: http://xdaforums.com/showthread.php?t=2331691

Greenshot. Advanced screenshot tool. Plugins may not work. http://xdaforums.com/showpost.php?p=48682150&postcount=905

Native-ported libraries (mostly for developers/porters)

LZMA (compression): DLL

SDL (Simple Directmedia Layer). Used for a lot of game software, among other things. http://xdaforums.com/showpost.php?p=36620852&postcount=117

OpenSSL (cryptography toolkit). Used by a great many open source programs that do any crypto. May have some problems with elliptical curve crypto. http://xdaforums.com/showthread.php?t=2113595

Zlib (compression). Used by many open-source libraries that need to handle compressed data. http://xdaforums.com/showthread.php?t=2113684

libFLAC_static, libmad, libogg_static, libpng, libtheora_static, libvorbis_static, libvorbisfile_static (media codecs). Support popular audio and video compressed formats. https://www.dropbox.com/s/rhxn7pwygfh6pka/ARMlibs.zip

Boost. Commonly used C++ library/framework. Please do not download unless you need it, as doing so will use considerable bandwidth from the host. http://xdaforums.com/showpost.php?p=38313568&postcount=524

wxWidgets. Common C++ library/framework for cross-platform graphical apps. https://dl.dropbox.com/u/39887/wxMSW-2.8.12-libs.7z

MFC (Microsoft Foundation Classes). C++ library/framework used by many older Windows programs. http://xdaforums.com/showpost.php?p=40802296&postcount=59

GlDirect (OpenGL-DirectX wrapper). Adds support for OpenGL code by wrapping Direct3D 9. http://xdaforums.com/showpost.php?p=42271138&postcount=4

QT 4.8.4 (C++ utility and graphics framework). Used by many cross-platform open-source programs. http://xdaforums.com/showthread.php?t=2339014

Apps removed for known issues:

MonoTorrent Client. BitTorrent client, both GUI and CLI. Currently experimental/alpha quality, many people have reported that they can't download anything. GUI, CLI, More info.