Aethera

Althea

Evolution

GnuMail.app

Ishmail

KMail

Mahogany

ML - A mail program for X and IMAP

ML - A mail program for X and IMAP

Mulberry

Mutt

PMail

Sylpheed

TkRat/Ratatosk

TradeClient

Archimedes, formerly known as XFMail

Postilion, a clone of the NeXT Mail.app

An Index of IMAP Products

Test IMAP server

Pros and Cons of the most common IMAP clients