OpenTTD - An open-source clone of the classic game ...

Roblox - Reimagining the way people come together.

Game Dev Tycoon - Game Dev Tycoon is an addictive, Strategy, Business Simulation, and Single-player video game developed and published by Greenheart Games.

Blockland - Blockland is a non-competitive multiplayer sandbox-style construction game. It's kind of like playing with legos on the internet.

The Paradise Cove - The Paradise Cove is playable, Action-Adventure, Casual, Building, Management, Massively Multiplayer Online, and RTS Simulation created and published by Pocket Games.

Garry’s Mod - Garry’s Mod is Funny, Sandbox, Co-op, Building, FPS, Action, Single and Multiplayer video game created by Facepunch and published by Valve.