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

Have you seen the https://openbb.co/ project? An open source Bloomberg Terminal project you may find interesting ;-). - Source: Hacker News / about 2 months ago

OpenBB- Democratizing investment research through an open source financial ecosystem. The OpenBB Terminal allows everyone to perform investment research, from everywhere. - Source: dev.to / 7 months ago

OpenBB: (Open Source Tool, highly recommended btw) +Fast & flexible (multiple reports for multiple companies with one line of code to one folder) +Standardized (All reports look the same). Source: 12 months ago

You might want to check out OpenBB, which includes plenty of terminal functionality for free. Source: about 1 year ago

Have you tried working with this? https://openbb.co. Source: about 1 year ago