tschumann's Stars
ValveSoftware/source-sdk-2013
The 2013 edition of the Source SDK
ValveSoftware/halflife
Half-Life 1 engine based games
ValveSoftware/ToGL
Direct3D to OpenGL abstraction layer
Facepunch/garrysmod
Sandbox mod for the Source Engine
ata4/bspsrc
A Source engine map decompiler
ValveSoftware/csgo-demoinfo
CS:GO demo parsing tool
alliedmodders/hl2sdk
Half-Life 2 SDK Mirrors
unknownworlds/NS
Natural Selection mod for Half-life
mapbase-source/source-sdk-2013
This is Mapbase's public GitHub repo. It contains all of the code, but not the assets.
Enhanced-Source-Project/Enhanced-Source
This is an unofficial updated branch of the Alien Swarm branch of the Source Engine. The project focuses on improving functionalities of the engine while keeping it developer friendly.
Facepunch/gmad
Garry's Mod Addon Creator and Extractor
Facepunch/gmod-module-base
The base interface to create binary modules for Garry's Mod
twhl-community/halflife-op4-updated
Half-Life: Opposing Force SDK based on Half-Life Updated, with bug fixes. Check README.md for more information.
Sandern/lambdawars
Source code of Lambda Wars game, available on the Steam
Triang3l/BS2PC
Half-Life PlayStation 2 map converter
supadupaplex/ps2-hl-tools
Tools for Playstation 2 Half-Life port
THE-HAVOK/source-sdk-2013
My personal edit of the 2013 Source SDK built for level design.
tonysergi/source-sdk-2013
The 2013 edition of the Source SDK
twhl-community/czeror-sdk
Condition Zero Deleted Scenes SDK. Contains trigger_sequence and the material system only
punyhumangames/bsmaps
Here you can find our Blade Symphony maps' .vmf files.
punyhumangames/bscharacters
Blade Symphony Character Assets
BerntA/tfo-code
The Forgotten Ones Source Code
Facepunch/gmod-html
GMod's HTML interface and implementations
CRACKbomber/Source360
A collection of tools and libraries for the Source Engine on the Xbox 360
punyhumangames/bsbalance
Blade Symphony Gameplay Balance Scripts
supadupaplex/PVR2MDL
Converts Dreamcast Half-Life models with *.PVR textures to normal PC Half-Life format
punyhumangames/bs_sfm_content
Blade Symphony SFM Content
punyhumangames/bs_sfm_game
Blade Symphony SFM Game
puzl/NS3.2