Supports 4k video editing. Free and open source.
Github for source code
https://github.com/mltframework/shotcut
Tutorials
http://www.shotcut.org/bin/view/Shotcut/Tutorials
Davinci Resolve 11 is also another great free alternative. Looks more professional too.
You legend, Scrimshaw, this is great. Thanks!
Along somewhat similar lines, does anyone know of good free animation creation/manipulation software?
Blender is free too, and it's been around for many years. It is primarily used for CG graphics, but it can be used for video editing purposes (but it is not the best tool for doing so, because what a video editing software can do in a few button presses takes much longer to perform in blender)
https://www.blender.org/
and it is compatible with a large number of other rendering engines, Open source free ones include:
Luxrender
Yafaray
POV-Ray (exporter)
Aqsis
Jot (exporter)
Mitsuba implement biased and unbiased rendering techniques (Exporter)
Some non-open source engines:
Octane, fast GPU renderer integrated into blender (Commercial)
Vray, production proven render engine. (Commercial)
Handy, thanks :-). Will try it out.