Description: Duolingo is a free language-learning platform that offers over 100 total courses across more than 30 languages. The bite-sized lessons make it easy to learn a new language through fun, quick activities on your phone, tablet, or computer.
Type: software
Pricing: Freemium
Description: Wikibase is a free and open-source software developed by the Wikimedia Foundation to power Wikidata. It provides a collaborative knowledge base that supports structured data and linked data principles.
Type: software
Pricing: Open Source