modding topic
MetaHookSv
MetaHook (https://github.com/nagist/metahook) porting for SvEngine (GoldSrc engine modified by Sven-Coop)
xoreos-tools
Tools to help the development of xoreos
gsc-tool
A utility to compile & decompile IW engine game scripts.
HedgeLib
A C++ library and collection of tools that aims to make modding games in the Sonic the Hedgehog franchise easier.
CTR-tools
Crash Team Racing (PS1) tools - a C# framework and a set of tools by DCxDemo to parse files found in the original kart racing game by Naughty Dog (and a bit of Crash Bash too).
Vertex-Client-PE
Vertex Client PE - A Hacked Client for MCPE
viper
Launcher+Updater for TF|2 Northstar
openage-data
Free (as in freedom) media files for openage.