Pixel Dungeon - Pixel Dungeon is a traditional roguelike game with pixel-art graphics and simple interface.
Unity - The multiplatform game creation tools for everyone.
Caves of Qud - Caves of Qud is an Awesome, Action, Rough-like, Strategy, Role-playing, Top-Down, Turn-based Tactics and Single-player video game created and published by Freehold Games.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Hoplite - Hoplite is a Role-playing and Single-player video game developed by Magma Fortress for Mobile Devices.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.