Unity - The multiplatform game creation tools for everyone.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Godot Engine - Feature-packed 2D and 3D open source game engine.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
JabRef - Graphical Java application for managing bibtex (. bib) databases.JabRef · JabRef Help · JabRef | Blog · OpenOffice/LibreOffice .