There is a program for OS X called Xeoma which appears to have very favorable reviews. http://felenasoft.com/xeoma/ It isn't free, but it appears to have a lot of features. You mentioned you wanted to be able to start/stop recording, but I couldn't find this feature in the software. It doesn't seem to take up too much space and was the best option I could find after some digging. I will continue to do some searching, but let me know how the trial version works for you.