Libretaxi: a free, open, cash-only alternative to Uber, for the rest of the world

Libretaxi is an open source project that lets anyone become a rideshare driver in less than a minute; it has more than 20,000 users worldwide, and is maintained by Roman Pushkin, who started the project in December 2016 and is now planning to quit his job and work on it full time. (more")