For anyone looking for a non commercial option, https://joinmobilizon.org/en/ has made some great improvements lately. - Source: Hacker News / 5 months ago

Framasoft is also involved in the development of Mobilizon, a decentralized and federated alternative to Facebook Events. Source: about 1 year ago

Framasoft is also involved in the development of Mobilizon, a decentralized and federated alternative to Facebook Events. Source: over 1 year ago

Not sure it covers all your requirements, but have you looked at Mobilizon (meetup.com alternative)? Source: about 2 years ago

Meetup is alive, but it is more or less as you say, the groups has cost (normally the people from a group paid together). There is a free software alternatives (but I don't know if there are good servers with a lot of people and groups running): https://joinmobilizon.org/en/. - Source: Hacker News / about 2 years ago

Crowdin.com — Unlimited projects, unlimited strings, and collaborators for Open Source. - Source: dev.to / 4 months ago

We're using Crowdin for this, since we need to localise with external partners to different languages: https://crowdin.com/. But there are other options on the market that are geared more towards providing a true source of text, like Frontitude or Ditto: Https://www.frontitude.com/ Https://www.dittowords.com/. Source: 6 months ago

You can try crowdin.com for coordinating translation. Source: 11 months ago

Any specific recommendations on which one to choose? Any translation system to recommend? Such as https://crowdin.com/? Source: about 1 year ago

For translations I can recommend you to use sites such as Crowdin, OneSky, Transifex, Weblate. Lot of smaller (singe or small team) developers are handling translations with the help of their users. You would be surprised how easy and how fast it is to manage translations at no (or nearly) cost this way. There is a lot of users willing to help to translate the app to their native languages. Source: about 1 year ago