GuideGuide - GuideGuide is the Photoshop and Illustrator panel that makes working with guides.
Unity - The multiplatform game creation tools for everyone.
Q2ID - Q2ID is an affordable InDesign plugin which allows user to convert and open QuarkXPress documents in Adobe InDesign.
Godot Engine - Feature-packed 2D and 3D open source game engine.
phpAlbum - phpAlbum.net is an Open Source PHP script which allows creating personal Photo Album / Gallery
Blender - Blender is the open source, cross platform suite of tools for 3D creation.