Description: OpenLevelUp is an open source alternative to Duolingo. It provides a web-based platform for learning languages through interactive lessons, flashcards, stories, and quizzes. The focus is on vocabulary building, grammar, reading, writing, listening, and speaking skills.
Type: software
Pricing: Open Source
Description: OpenStreetMap is a free, open-source, crowd-sourced map of the world. Volunteers collect map data using GPS devices, aerial imagery, local knowledge, and other free sources to create and update the map database.
Type: software
Pricing: Open Source