With Browser Fairy you can have individual default web browsers for every app and every web page.
utilities
How to use Chrome single-site browsers on a Mac
TNEF’s Enough
Handy OS X app to open winmail.dat attachments sent by Outlook users.
Xiki
via @bantik “A shell console with GUI features. Xiki does what shell consoles do, but lets you edit everything at any time. It’s trivial to make your own commands and menus to access other tools.”
Bark for Growl
“Bark intelligently brings notifications from Growl into Notification Center under OS X Mountain Lion”
Brush Pilot
“The fast and easy Photoshop brush previewer for Mac OS X”