Mobilizon is an open source software for event planning and group management, launched in October 2020[1] by Framasoft to offer a free alternative to the platforms of GAFAM (Facebook, Meetup.com, EventBrite).

[2][3] Mobilizon gained much visibility in hacker circles relatively fast, but also soon within cultural scene in Europe and more recently in the mainstream IT media.

[4][5] The features offered by Mobilizon at the time of the beta launch in October 2019 were:[6][7] Some instances aim at specific cultural and social impact with the support for multi-lingual communities like the Swiss instance supporting German, French, English, Swiss High German, and Italian language.

[9] A test platform was put online on October 15, 2019, to allow people supporting the project to discover the tool and get first impressions from the general public.

[1] As of February 7, 2025, there are 79 Mobilizon instances located worldwide, with cumulatively 4,188 groups that created 376,753 events.