Choosy - Choosy opens links in different browsers as specified, according to rules, set by the user.
Finicky - A MacOS app for creating rules that decide which browser is opened for every link that would open...
Browser Select - Browser Select is a utility to dynamically select the browser you want instead of just having one...
Switchbar - Open links in the right email clients, browsers or profiles
Browser Picker - A default browser replacement for windows to let you pick your preferred browser on the fly.
Browser Tamer - Makes correct URLs open in browsers you want instead of the system defaults.