Here is a list of free/libre and open source games that are available on Steam. Enjoy! Improve the list if you know another one! Most of the time, the games here are totally FLOSS, where every assets, ...

melonJS is an open-source 2.5D game engine designed for indie developers — perspective and orthogonal cameras, GPU-accelerated tilemap rendering, post-processing effects, custom shaders, 3D mesh ...

Decodo is a proxy platform that offers a wide range of features and very competitive pricing.