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.
VocApp.com
Free
VocApp.com is a vocabulary improvement software platform.
Memrise
Freemium
Memrise is a Language learning Platform with a website and iOS and Android Apps.
Learning with Texts
Open Source
Learning with Texts (LWT) is a tool for Language Learning, inspired by Stephen Krashen's principles in Second Language Acquisition.
Compare SuperMemo with alternatives
Compare Learning with Texts and SuperMemo and decide which is most suitable for you.
Compare VocApp.com and SuperMemo and decide which is most suitable for you.