Discord

The Discord client dosen’t work but some features can still be accessed by an updated web browser.

New Moon 28.x, Mypal 68.x and later and some Chromium variants tend to work better. Firefox variants and Mypal 29.x tend to cause issues such as Broken TextBox during Chat or Crashing issues. New Moon 27.x usually don't work with Discord.

There is also the purple-discord plugin for Pidgin which might suit your needs, by Eion Robb (tested on XP recently-ish by me)