Fragsurf is an actively developed standalone game based on HL2 surf and bhop movement mechanics.

Prometheus Exporter for SRCDS game servers, working with CSGO, CSS, GMod, HL2, L4D2 and TF2 !

Used to parse source demos.

Porting Half-Life 2 base to the Alien Swarm Engine

Blamod Reborn Acrhive. See the link instead.

☢️ An up-to-date Source Server Query protocol library written in C99

BrainBread 2 Source Code

The Forgotten Ones Source Code

Team Fortress 2 server plugin that allows players to sprint like in Half-Life 2

A slimmed down and improved version of the Source SDK 2013 map compile tools

A collection of maps for Source Engine based mods.

Fixes a bug that reduces air-acceleration while crouched in CS:S

LuminousForts C++ Source Code

An addon for Garry's Mod that mimicks the Heads Up Display feature from Valve's 2004 game Half-Life 2 adding a deep customization layer to it.

Half-Life 2 related tools for Garry's Mod Sandbox gamemode

Half-Life: Blue Shift Co-op

https://forums.alliedmods.net/showthread.php?t=267805

Q3 .map to HL2 .vmf converter

HGSM-HattrickGameServerManager

A simple Blazor powered game server browser