For Macs! Ha, fooled you PC people. But if it's available for mac, then go ahead.
I'd like to focus on freeware, but it doesn't matter.
Time savers, browser extensions, awesome audio/video converters/players.
I'll start and throw out some that many of you probably have, if not you should.
VLC-All kinds of video Player (mac & PC), Handbrake, all kinds of video formats converter (mac & PC)
I have a lot, but there's a start.