OpenRA is a real time strategy gaming engine, which reimplements Command & Conquer: Red Alert and Tiberian Dawn mods, as well as Dune 2000. They're not exact copies, but allow modern cross-platform gameplay with new features and graphical improvements.
HandBrake is a video file conversion tool. It supports nearly all formats, can transcode media files and codecs for various platforms, players and devices (includes a user-friendly target list to select from). It has an uncomplicated interface and is available cross-platform.
Remote Desktop P2P based. Portable, No configuration or installation needed, communicate your endpoint to the peer, and vice versa, press connect and enjoy.