A modern customization framework for Team Fortress 2

Tool to mod Portal 2's Puzzlemaker

The Blender Source Tools add Source engine support to Blender, the free 3D modelling suite.

A more convenient alternative to Blender Source Tools.

Python library for analysing .bsp files

Import Source game content into Source 2

Modules for working with Valve's Source Engine file formats.

Titanfall wiki about advanced topic such as modding, data-mining, reverse engineering, commands, etc.

Scripting CS:GO over telnet.

Source Engine level converter for Call of Duty.

scalu is an event-based programming language and compiler targeting config files in Valve's Source Engine

A python VMF parser

A Python-powered gui for converting pbr materials into Source Engine-compatible materials.

python alternative to Valve's "Hammer World Editor"

Blender plugin that allows for easier modding and animation of the Gold Source/Source/Titanfall armatures.

An open source, cross-platform audio player for Source and GoldSrc engine based games, written in Python

Essential tools for Counter Strike 2 Workshop Tools : SoundEvent Editor, SmartProp Editor, Hotkey Editor, Loading Editor

Half Life 2 ARM Patcher

Blender plugin to automatically generate Source Engine .qc, .vtf, and .vmt files.

Tools for importing Source Engine material (.vmt) files into Blender