Send balls through an invisible grid of mirrors (and other interesting widgets) and observe where they end up. Then, try to recreate the same grid from the results you just obtained.

Cubeview is a viewer for 3D data store in FITS files, a file format extensively used among astronomers. It is specialized in displaying spectro-imaging data but can be used to do basic visualization on any FITS file containing a 3D array.

Open source libraries and utilities to support using digital signatures for amateur radio QSL information.

supports both seamless applications (via Xpra, NX and ssh) and full remote desktops (via NX, VNC, RDP). Once a session has been started via winswitch, it can be displayed on any other networked machine running the winswitch client.

TorChat is a peer to peer instant messenger with a completely decentralized design, built on top of Tor's location hidden services, providing strong anonymity while being very easy to use