Source / GoldSrc mods and Valve fangames
Including games that started out as mods and became full releases.
Similar lists:
https://www.backloggd.com/u/diddy/list/50-half-life-modifications/
https://www.backloggd.com/u/megafat1/list/half-life-1-mods/
https://www.backloggd.com/u/megafat1/list/half-life-2-mods/
https://www.backloggd.com/u/megafat1/list/portal-1--2-mods/
https://www.backloggd.com/u/megafat1/list/valve-fan-games/
https://www.backloggd.com/u/Snivius/list/half-life-2-mods/
Similar lists:
https://www.backloggd.com/u/diddy/list/50-half-life-modifications/
https://www.backloggd.com/u/megafat1/list/half-life-1-mods/
https://www.backloggd.com/u/megafat1/list/half-life-2-mods/
https://www.backloggd.com/u/megafat1/list/portal-1--2-mods/
https://www.backloggd.com/u/megafat1/list/valve-fan-games/
https://www.backloggd.com/u/Snivius/list/half-life-2-mods/
350 Games
Because you can still play early beta releases before it got picked up by valve
Because you can still play early beta releases before it got picked up by valve