Four short links: 8 October 2013
Video Editing, Game Engine, Python Debugger, and P2P VPN
Lightworks — open source non-linear video editing software, with quite a history.
Puzzlescript — open source puzzle game engine for HTML5.
pudb — full-screen (text-mode) Python debugger.
Freelan — free, open-source, multi-platform, highly-configurable and peer-to-peer VPN software.