RTS2 is project to create an open source environment for control of a fully autonomous observatory. It is running about dozen fully autonomous observatories. Its modular design allow easily addition of new devices (to already huge supported HW list).
Astro Info is a multi-lingual astronomical ephemeris for the PalmOS that provides data for our solar system and other objects. If you wish to get involved, please download a copy of the source code from CVS.
A library allowing in-memory use of FITS data. Provides a simple interface to many CFITSIO routines. This reads and writes FITS images, tables, and headers; and provides convenient structures for passing data to other software, eg. SExtractor library.
SExtractor (Source-Extractor) is a program that builds a catalogue of objects from an astronomical image. It is particularly oriented towards reduction of large scale galaxy-survey data, but it also performs well on moderately crowded star fields.