Vabotu - More than slack. More than Trello. FREE.
Unity - The multiplatform game creation tools for everyone.
Kurator - The premier Chrome extension for savvy researchers and publishers alike. Curate your interest and publish to your website, newsletter and social media sites directly from the browser.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Sensive - Design collaboration for everyone
Blender - Blender is the open source, cross platform suite of tools for 3D creation.