Started in 2012.
Full-time maintainer in 2014.
100% funded by the community since 2016.
Gina @foosel Häußge shares the journey of @OctoPrint3D (and a few life hacks along the way) on The ReadME Podcast.
https://github.com/readme/3d-sideproject-octoprint

https://twitter.com/github/status/1413181366519349248