Clear Sky Institute Inc.
astronomy software for UNIX

LinuxAstro
Astronomical software on Linux.

Nightfall Eclipsing Binary Star Program
Interactive, user-friendly binary star program for lightcurve synthesis, animated views, and data fitting. Can handle eccentric orbits, surface spots and asynchroneous rotation.

AstroMake
Astromake is a utility intended to make installations of some common astronomical packages (in binary form) easy. In practice it is a shell script that with the aid of makefiles wraps around rpm's, tarballs and debian packages.