Transitous is a community-run provider-neutral international public transport routing service.

Using openly available data and a FOSS routing engine we operate a free to use routing service that does not stop at borders.

• API | Transitous

Public Jabber Chat rooms
Christopher Muclumbus: A listing of public XMPP/Jabber chat rooms/groups.

Free vector and raster map data at 1:10m, 1:50m, and 1:110m scales

Terms of Use: All versions of Natural Earth raster + vector map data found on this website are in the public domain.

Keybase is a website, but it's also an open source command line program. Let's walk through a terminal example, which illustrates what Keybase does. All of this can be embedded into other software, written by anyone.