ScenicSkies is a open source planetarium software under development which in time is going to have photorealistic rendering of the skies both during the day and night.
The goal of spacesim is simulation of a battles in free space. Unlike other such games, spacesim models management of the ship from the point of view of the captain, instead of the pilot. It allows management of the ship of several players at one time.
MightySETIInfo. Yet another SETI@Home email sig/HTML summary. Written in C++. Uses the Fox GUI library, and ftp4w32. Only tested with Win32 but should be easy to port to *nix. Works with SetiHide. Output files are customizable with HTML-like templates.