Is a free and open logbook for (amateur-) astronomical observations

Observation Manager is a free and open logbook for (amateur-) astronomical observations. It's written in pure Java and runs on every plattform supporting Java 1.4 or higher.
All logbook entries made in Observation Manager are stored in the free and open OpenAstronomyLog XML Schema.

Log your observations and make sure next time you're searching for an celestial object you can make benefit of your past observations!