From Permanent Future Lab
Slack is a chat site. Join other enthusiasts in the Permanent Future Lab movement by requesting an open invite to have a conversation or ask a question. Some locations have their own #channel in Slack.
The Slack channel was created by the co-initiators behind Permanent Future Lab Vondel CS. Since June 2017 it is open for everyone. Since Slack is not an open chat by default, an open invite system was installed by creating a now instance with the Slackin software running on it.