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
Description: Wikipedia is a free, online encyclopedia written and maintained by a community of volunteers around the world. It contains over 50 million articles in hundreds of languages.
Type: software