IRC channels for mods

I saw the list of devs on Twitter, and thought it would be helpful to have the same thing for IRC channels, since I find it is a better way of communicating with developers. I've added some below that I was able to find through some searching, please submit more to comments.

Wondering what IRC is? Check this out.

irc://irc.esper.net:5555/
For ModLoader/Plain Modding : #RisuCraft
For Minecraft...

IRC channels for mods