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 support, something Slack doesn't offer.
- discord.me/transhumanism / transhumanism.chat - The network has been created by Carsten Kolassa and has the potential to be good generic transhumanist chat network.
- Life extension network around life extension advocacy
- Mind Uploading from Lifetimes Infinity
- Artificial Intelligence
- Scientific Transhumanism Project hub from Carla Parsons