Conversation Channels

IRC like alpha and omega,
Jitsi work super for chat and one on one conversations. Audio and video calls, 100% open source, encrypted by default, desktop sharing https://jitsi.org
Mumble for free and private conversations. Working awesome when all want to hear eachother. www.mumble.com
Video conference call without login, create your own room and start. With painless video conversations, anything is possible with appear.in.