BenMail is simple and fast Python/Qt based email client. Features multi-languge support, MIME attachments, multiple accounts, threading. It is thought to be very extensible.
Cameraray; 3D Exporter Solutions for Sketchfab
Cameraray is a 3D content exporter solution for Sketchfab that creates API's for 3D based meshes and Sketchfab compatible files.
Vooloo open-source web browser.