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Since 2018, the project uses GitHub for its source repository and bug tracker. In 2004, development moved to their own server. According to a study of the 61,154 open-source projects on SourceForge in the period between 19, OpenTTD ranked 8th most active open-source project to receive patches and contributions. OpenTTD is free and open-source software licensed under the GNU GPL-2-0-only and is under ongoing development. OpenTTD also supports local area network (LAN) and Internet multiplayer, co-operative and competitive, for up to 255 players. OpenTTD duplicates most features of Transport Tycoon Deluxe and has many additions, including a range of map sizes, support for many languages, custom (user-made) artificial intelligence (AI), downloadable customisations, ports for several widely used operating systems, and a more user-friendly interface. It is an open-source remake and expansion of the 1995 Chris Sawyer video game Transport Tycoon Deluxe. OpenTTD is a business simulation game in which players try to earn money by transporting passengers, minerals and goods via road, rail, water and air.
