There's also ProVoc for OS X which was great in its time, and still works, but has now abandoned: http://www.arizona-software.ch/provoc/ http://www.arizona-sof

There's also ProVoc for OS X which was great in its time, and still works, but has now abandoned: http://www.arizona-software.ch/provoc/ http://www.arizona-software.ch/provoc/ But luckily it's been forked and now lives on as iVocabulary: http://apps.chbeer.de/ivocabulary/ http://apps.chbeer.de/ivocabulary/ I don't know if it's strictly an SRS app or not? It's certainly smart though, and is available on OS X and iOS and has a web interface too.