The 1.321 version of Observation Manager for Mac is available as a free download on our website. This free software for Mac OS X is a product of Dirk Lehmann. The application relates to Education Tools.
From the developer:
Observation Manager is a free and open logbook for (amateur-) astronomical observations.
You may want to check out more Mac applications, such as MeD's Movie Manager, Home Loan Manager Pro or Soccer Manager 2015, which might be similar to Observation Manager.