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i am mostly a mac guy, so some of these are osx specific.
xylescope
this is, without doubt, the best css editor ever. it's insanely fantastic.
xcode
my favorite ide. i can't believe someone upthread mentioned eclipse.
colloquy
a decent irc client for osx. decent is about as good as it gets in this domain, unfortunately.
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I always liked Adium for all protocols. I tried Colloquy as well, but it's not better enough to rationalize a second program running.