Open-Source Alternatives to Meetup

ℹ️ Pull-requests are welcome!

Name	Source	Maturity¹	Backend Language	License
Agorakit	GitHub	mature	PHP	GPLv3
attendize	GitHub	mature	PHP	Attribution Assurance License
Calendar.social	gitea	inactive	Python	AGPLv3
Chapter by freeCodeCamp	GitHub	new	JavaScript	BSD 3-Clause
Communecter	GitHub	inactive	PHP	Apache 2.0
eventoL	GitHub	mature	Python	GPLv3
Friendica	GitHub	mature	PHP	AGPLv3
Gancio	Framagit	new	JavaScript	AGPLv3
Gath	GitHub	new	JavaScript	GPLv3
GetTogether	GitHub	mature	Python	BSD 2-Clause
Gospeak	GitHub	mature	Scala	Apache 2.0
Hubzilla	Framagit	mature	PHP	MIT
Human Connection	GitHub	mature	JavaScript	MIT
joind.in	GitHub	mature	PHP	BSD 3-Clause
Meetdown	GitHub	inactive	Structr	Apache 2.0
Meetup Alternative by Thinkmill	GitHub	inactive	JavaScript	unlicensed
Mobilizon	framagit.org	in development	Elixir	AGPL
on_ruby	GitHub	mature	Ruby	(extended) Beer-ware
Open Event	GitHub: Frontend, Backend	mature	Python	Apache 2.0 & GPLv3
Open Tech Calendar	GitLab	mature	PHP	BSD 3-Clause
Openki	Gitlab	mature	MeteorJS	AGPLv3
OSEM	GitHub	mature	Ruby	MIT
Pretix	Gitlab	mature	Python	Apache 2.0
Upcoming	GitHub	mature	JavaScript	Apache 2.0

¹: mature = the project is actively used by groups, new = this is a new project with no usable software, in development = usable software exists, but is not ready for general use, inactive = was under development, but more than 1 year without commits

See also

https://phacks.dev/meetup-com-alternatives