Trello
Trello is a free web-based project management application originally made by Fog Creek Software in 2011, that spun out to be its own company in 2014. It operates a freemium business model, as well as being cross-subsidized by other Fog Creek Software products. A basic service is provided free of charge, though a Business Class paid-for service was launched in 2013. In July 2012, the site surpassed 500,000 users. They then claimed December 2012, it had surpassed 1,000,000 and in May 7, 2014 claimed the number to be four million. On September 18, 2014 Trello reached over five million users.
