Always looking for quick and efficient tools to help with music production. Stumbled on a great one recently. Antidote Audio offer a nice little, no-nonsense mastering plug-in that you can whack on the master track when you're in a rush or just want to hear what it might sound like mastered. Eight knobs to twiddle and it's f-f-f-f-f-free! I've found it useful when I need to master at the last minute for a show or try out a new remix in a set. It's quick and probably dirty.
Sam Antidote is also a little bit cute and knows how to churn out those music production tutorial vids. He also has a lot of other free stuff here. Thanks Sam!