Moddable

A modern-day open-world RPG about a secret world. With the help of your companions, some demons, some cats, and any supernatural entities you can bend to your will, all the different ways to solve problems, you may still fail to save the world. Life is simply unfair. But, will you stop trying?

Drunken Wrestlers 2 is a funny physics-based multiplayer fighting game. Features include character customization and a powerful mod editor integrated with Steam Workshop.

The ultimate space simulator game, precisely modeling the space and space environment inside the International Space Station (ISS).

Open Source Rhythm Game

NOT the latest version, please check out PSF 2026!

A rocket engine design sim with real physics. Wire pumps, injectors and nozzles on a node graph, set the numbers, and test fire. Live graphs and 3D hardware answer every change. Fourteen guided missions with a senior engineer, or free build. Recreate the Merlin 1D, or build one that shouldn't work.

A free social world for VR and desktop. Hang out in an always-on hub, wear avatars made by the community, and explore worlds built and published by players through Steam Workshop.

Start in 1980 in your garage and build your software empire. Unlock languages from BASIC to Python, develop projects, hire programmers and upgrade your office. Survive deadlines, bugs and demanding clients in this tycoon simulation.

Collider is a fast paced arcade game for 1 to 8 players.

XNemesis is a 2D shooter SandBox game, it is a package that contains fully featured levels, Level Designer Software that allows you to create/modify levels and Assets Pack(s) as ready Templates to use in your levels if you don't have/want to use your own images/animations.

Cartridge the Tiger is a Super Nintendo inspired platformer with a powerful in-game level editor. Built on a custom engine with retro physics, dynamic color-accurate lighting, and extensive mod support. A journey awaits, can you make it?

Kojimachi is a widget style pet game where you can feed and care for your pet on the island you decorate.