Kdenlive I haven't tried yet, but is on my short list to try.
I've been using LightWorks under Linux and it works pretty well. I mean, I have nothing else to compare it to, but I'm doing 4K30fps video, and a friend of mine tells me that his Macbook Pro with Adobe tools isn't up to the task. I'm running on a 5 year old PC I had in the closet (870K CPU, 16GB RAM, Radeon, SSD), and it works fairly well.
The only downside of Lightworks so far has been that to export to Youtube at 4K you have to "subscribe", you can't just buy the software. You can do your editing and play with it, and export 720p video.
But to export 4K, you have to either pay $25/mo or $170/year. I wasn't sure how much I'd like editing video, so I didn't want to pay $170. so I did the $25 for a month. I'm really enjoying it, but I kind of wish I could just pay $200-$300 and be done with it. Which I realize isn't rational, because that'll buy a lot of $25 months.
Other ones I want to try: Kdenlive, Davinci Resolve (tried it and it segfaulted, $170/year), Cinelerra (looks kind of crappy), Flowblade. Pitivi looks to be abandoned. Maybe I should try Blender, but I don't want to do any 3D stuff, don't want to get sidetracked.
There's also an online NL video editor that my daughter has used for school: wevideo. She showed it to me after seeing me running LightWorks and recognizing the workflow. I'm dealing with 75-200GB though, don't think that's going to work for online. Smaller video will probably work, my daughter uses it to voice-over a series of photos turned into video.
There are a few rough edges, but Lightworks has mostly let me, as a neophyte video guy, to make great videos. Took me an hour to import an MP3 this weekend though.