Unity - The multiplatform game creation tools for everyone.
Splitwise - Splitwise is a free tool for friends and roommates to track bills and other shared expenses, so that everyone gets paid back. On the web, iPhone, and Android!
Godot Engine - Feature-packed 2D and 3D open source game engine.
Kittysplit - The easiest way of sharing costs with a group of friends
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
ihatemoney - Manage your shared expenses, easily