I'm using Cinelerra. It has a bit of learning curve, but there are tutorials on
Youtube, and a web site called "Cinelerra for Grandma" which got me going. It
has a multi-window user interface, like GIMP, which some people find confusing.
I find it has all the features I want, and it rocks on my machine.

One thing though: I have to convert videos from AVC format. I use "Video
Converter," a GUI front-end for ffmpeg, and convert to MOV format. You may find
this is also true with other video editors.