For chat about #foss4g (the #osgeo conferences) you can now use https://matrix.to/#/#foss4g:osgeo.org - the Matrix room is bridged to the historical #foss4g IRC channel
Matrix - Decentralised and secure communication
You're invited to talk on Matrix. If you don't already have a client this link will help you pick one, and join the conversation. If you already have one, this link will help you join the conversationmatrix.to