Forum Portal Software

Is there a software for Mac OS specifically designed as a portal for forum browsing/posting besides standard web browsers? Some features:

-Standardized viewing format and size
-Easily browse multiple forums
-Easily post on multiple forums
-Receive updates/new messages

I've noticed that many forums I check use Vbulletin, I'm wondering if they have software for that standard.

Currently I'm using multiple tabs open in Firefox, and when I post copying and pasting Subject, Body Text and Tags with TextEdit. Seems kinda old school. I believe iOS has specialized forum browsing software.

Any info much appreciated!

HL