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: Yelp is a website and mobile app that provides crowdsourced reviews about local businesses. Users can read and write reviews, rate their experience, and search for restaurants, shops, services, and other businesses in their area.
Type: software