For me this was a great programming experience since I have just implemented my very first drag'n'drop timeline, as seen in many editors (well, not that pro, of course). It was one of those nights when everything goes fast and results in success, so after a few hours I was able to dragndop/position etc. movies on my timeline, programed from scatch (aka not using 3rd party modules). Now I only need to add audio support and transitions the sooner or later and Dr Green is going to be a simple but handy fullfledged editor. However.
Even now it may be used for greenscreening since it can do matteline color neutralizing, helping to disguise the greenishness of a matteline without to cut off too much of the soft contours.
Additionally it contains a Glow filter, something that is not included most cheap editors.
Have a look:
http://www.melog.ch/drgreen/
