Support over IRC is historical in open source.

irc.perl.org -- perl language support and development

irc.mozilla.org -- mozila related support and development

irc.freenode.net has many support channels:

#mysql

#postgresql

#vim

#emacs

#nodejs

#css

#javascript

#python

#manjaro -- manjaro linux distro

#archlinux -- arch linux distro

#freebsd

#linux

#vuejs -- horrible support (frontend channel)

#angularjs -- horrible support (frontend channel)

#elasticsearch

#sqlite

#xen

#docker

#git

and the list goes on. many great people there :)