Java based astronomical logging software which stores it's data in a free and open XML based format (OpenAstronomyLog).
Discontinued project: Please check out the fork: https://github.com/capape/observation-manager for an updated version
retep is a collection of Java API's covering PDF, XML, J2EE , Swing and now NetBeans modules for displaying astronomical maps, controlling modern "Go-To" telescopes - all in java., and accessing online databases.