Ferdi

Ferdi is based on Franz - a messaging browser already used by thousands of people. Due to this, Ferdi is compatible with all Franz recipes and your existing Franz account.

all the stuff you need and a lot of the stuff that you don't! -- no restrictions on usage either, a really well put together fork of the original code, if you tried franz and that did not work out for you then you might have better luck with this intergration version.