Unlike Slack, it is entirely free and you can view channels as a guest without mandatory registration or invitation. There are web, desktop and mobile clients for it.
There is native voice chat room support, something Slack doesn't offer.
|Transhumanism||transhumanism.chat||The network has been created by Carsten Kolassa and has the potential to be good generic transhumanist chat network.|
|Futurist Foundation||The Futurist Foundation||Centralized community for all people interested in working on projects and discussion|
|Healthspan||Life extension and healthspan advocacy and activism. Features a regular voice chat group.|
|Lifespan.io (dead link)||Life Extension Advocacy Foundation||Life extension advocacy and activism. Features a regular voice chat group.|
|Mind Uploading||Lifetimes Infinity||Mind uploading discussion|
|Artificial Intelligence||AI discussion|
|Empirical Transhumanism||Project hub from Carla Parsons|
|TechnoLibertarians||Technolibertarianism||Chat from Mike Lorrey (Inactive)|
|Futurology||Endorsed by Reddit r/Futurology/|
|Zero State||Endorsed by Zero State |
|Foundation||Endorsed by The Foundation |