I am the founder of @Openwords, an open source and OER language learning app.
Openwords app is a mobile/web app that presents a variety of language learning problems to students: sentence construction, conjugation, simple review, hearing, fill in the blank and other types. Openwords is free and open source. A lesson builder and lesson format allows instructors to creatively design and build lessons that their students can take outside of the classroom.
Please feel free to contact me for any reason.