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A useful overview and reference to the IRC client protocol as it is implemented today.
IRC Developer Documentation
More up-to-date IRC Definition Lists
Tests for IRC Parsers
An experimental IRC documentation site
irc preload lists maybe
Wall of Outdated or Otherwise Misleading Specs
best practices for IRC software
IRC Test Suite (very basic and in development)
lays out the mission/goals for ircdocs and the projects I think are worth maintaining
Archives of IRC-related Usenet groups
Translations of IRC numeric strings and similar