This article is not explicit about exclusive about "Free as in freedom" offerings, is it?
There is one really big fish in the sea of video editors: Lightworks.
There is a free-as-in-beer version and it works like a charm, at least for me (on Fedora 23, on a relatively recent and powerful computer).
The features you don't get without paying are: rendering your project at higher than 720p, multi-monitor support, and some other features for pro-level work on long films, regarding managing multiple storage areas for your stuff.
The editing workflow is really excellent. If you are a cheapskate and still want that 4king massive video resolution you can work on your project with the free version and then buy a month's license to export your project (a month is US$25 or something like that).
I've only discovered it this year, but it's been around as a professional tool for donkey's, on Linux as well as Windows or Mac (with identical user interfaces), so the time you invest in climbing the learning curve is not locking you into a platform.
Kudos to the Lightworks team for creating such an amazing tool and making it available via the freemium model for us cheapskates!