mIRC is the generally recommended client on Windows, though I found X-Chat 2 to be slightly preferable (and I believe actually free, unlike mIRC which is shareware). If, however, you happen to be on a Mac then I'd recommend Colloquy, which is a free client.
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Shareware in so far as if you don't register, you have to wait, what, about 5 seconds before it starts?
Possibly there are some higher functions locked up but I struggle with the basics so the trial version suits me just fine.
Jam it back in, in the dark.