Mac users interested in Latin etymology generally download:
Glossa combines a unique interface with a commitment to full exploration of a Latin word's possible meanings. The type-ahead suggest feature allows words to be found easily as you type, and the database gives you full definitions of words, including examples from Latin literature and etymologies.
Latin Vocab Drill offers customizable, interactive drills on vocabulary lists with etymological hints and handy references. Four different formats provide a variety of approaches to any number of lists from each version module. Scores can be recorded and sorted in an easy-to-read, printable chart format.