Anki
Open Source
Anki is a spaced repetition flashcard program. Anki is the Japanese word for memorization.
AnkiApp
Commercial
AnkiApp is a flashcard app for iOS (iPhone + iPad), MacOS, and Android.
Memrise
Freemium
Memrise is a Language learning Platform with a website and iOS and Android Apps.
VocApp.com
Free
VocApp.com is a vocabulary improvement software platform.
Compare SuperMemo with alternatives
Compare VocApp.com and SuperMemo and decide which is most suitable for you.