New: Don't Sleep (Jul 11, 2022), Platform 22.0.1 (Jul 21, 2022)
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Downloads From PortableApps.com Working Again
Here is a small IRC client:
It works quite well.
you also should be able to use Miranda plugin for IRC protocol,
aswell Chatzilla client (extension for firefox)
Embrace your dreams
This looked like a good alternative however.