Unity - The multiplatform game creation tools for everyone.
MediaWiki - MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia.
Godot Engine - Feature-packed 2D and 3D open source game engine.
TiddlyWiki - a non-linear personal web notebook
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Confluence - Confluence is content collaboration software that changes how modern teams work