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

Client Support

Desktop Clients

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

Web Clients

Feature IRCCloud Iris Kiwi IRC The Lounge Mibbit

Mobile Clients

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

Bouncers

Feature ZNC

Bots

Feature Limnoria Sopel (ex Willie) Moon Moon

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