The 0.8.15.1 version of Irssi is available as a free download on our website. Irssi lies within Internet & Network Tools, more precisely General. This free program was originally designed by Irssi Team. The most popular version among the software users is 0.8.
From the developer:
The Irssi for Windows installer and portable packages are finally in the process of being updated for Irssi .
You may want to check out more software, such as Smuxi, which might be similar to Irssi.