IRC SASL authentication primarily uses the same mechanisms as SASL in other protocols. Most commonly:

Client Support

Desktop Clients

Feature AdiIRC BitchX ChatZilla Colloquy HexChat IceChat Irssi Konversation KVIrc
Feature LimeChat mIRC Mozilla Thunderbird Quassel Textual WeeChat Srain Swirc

Web Clients

Feature IRCCloud Iris Kiwi IRC The Lounge Mibbit

Mobile Clients

Feature AndChat
IRC for Android
AndroIRC
Colloquy
Igloo
IRC7
IRCCloud
LimeChat
Mutter
Feature Palaver
YAAIC

Bouncers

Bots

Feature Limnoria Sopel (ex Willie) Moon Moon PyLink (clientbot) BitBot

Libraries

Feature cinch Ruby Communi C++ girc Go irc-framework JS Kitteh IRC Client Library Java Net::Async::IRC Perl pydle Python Rust irc Rust Warren Kotlin
Feature zIRC Python ChatSharp C#

Services Support