Source SDK 2013 community repos

The Source modding community has stepped up to maintain various repositories that include Valve's SDK code with various additions and bug fixes. Below is a list of some of these community created code repositories. If you've made your own GitHub repository and would like to release it to the general Source modding community, please feel free to add it to this list:

Repo	Description
Nbc66/source-sdk-2013-ce	Nbc66 & Ian B.'s repo contains the SDK 2013 source with bug fixes and optional enhancements/experimental additions. It also includes support for the v142 toolset which grants the ability to compile with Visual Studio Code 2019, eliminating the need to use VS2013.
Creators-of-Strilling/AdrikikiSource	Adrikikicp's repo adds LUA support into the engine. Still in test. Fork of Source: Community Edition
ozxybox/source-mp-vs2022	Ozxybox's rep contains the SDK 2013 source, tweaked to work with Visual Studio Code 2022
Mapbase	Improves the engine and entities to be more capable and stable for mapping and other kinds of modding without changing too much of the game itself. It's designed to be used as a platform for mappers to build their maps on and for larger mods to draw code from. Mapbase is generally used as a massive package of utility features and general-purpose fixes.
jimbomcb/source-sdk-2013 [dead link]	John McBroom's repo contains the SDK 2013 source with bug fixes.
saul/source-sdk-2013	Saul Rennison's repo contains the SDK 2013 source with bug fixes and a few features.
fuzzzzzz/source-sdk-2013 [dead link]	Nicolas Kirsch's repo contains the SDK 2013 source with bug fixes and a few features.
sandern/py-source-sdk-2013	Sander van Noort's repo contains the SDK 2013 source with auto generated bindings for Python 3
IVEngine 2	Huge changes to the gameplay and engine, including new GameUI.
tonysergi/source-sdk-2013	Tony "Omega" Sergi's fork, with some official changes that got lost in the transition to GitHub.