IRC and Gitter
IRC (or Internet Relay Chat) has been around since the '80s and it's still used all over the world.
First Step: Get an IRC Client or Skip to "Webchat"
Browser-BasedChatzilla for Firefox (requires browser restart)
MultiplatformXChat (for Lin and Win)
Next Steps: Join a Channel
In Firefox (with the built-in IRC client installed), visit webchat.freenode.net/?channels=#zombie-floss
Many open source projects have IRC rooms associated with them. A few are listed below. Check the websites for projects you're interested in to find more! To join one of these, select or enter the freenode server and use the command /join #channel_or_room_name
- irc.freenode.org/#openhatch, with helpful wiki at https://openhatch.org/wiki/Contact
- Wikimedia has such a tremendouse presence on IRC that they've an entire wiki devoted to cataloging all of their channels.