While at work I use the hell out of Firefox (portable), and OpenOffice (portable). I love the power and flexibility of these apps.
Firefox, for those of you that use it has the ability to add features through an excellent plug in system that developers can access. I came across this list of plugins that are great but not widely know about, but are worth their weight in gold. I didn’t even know about some of them.
10 Useful Firefox Extensions That Don’t Get Glamorised (Connected Internet News | Broadband Mobile Gaming News)