Cinelerra works well - and has for years.
You have got to be kidding.
I have tried on several different occasions to get Cinelerra to do something useful, and have failed every time. The program is incredibly unreliable, and will crash or hang at the slightest provocation.
There are two versions in circulation -- the "original" Heroine Virtual version, still occasionally updated; and the "community" version. I have no idea what the alleged differences are.
It claims to accept a wide variety of video codecs, but in my experiments only appears to reliably support DV -- an uncompressed format that will quickly fill every disk you have.
Like Blender 3D, Cinelerra blazes its own trail for the user interface. In fairness, if you have some patience, it will gradually start to make sense. It's ugly as hell, but that ugliness could be forgiven if the program worked reliably and produced decent videos.
There are enough glowing reviews of Cinelerra out there to make me wonder if my setup is the problem, but I rather doubt it, since Kdenlive has worked just fine on the same machine. My current theory is that long-time Cinelerra users have learned over the years what bits are irredeemably flaky and just automatically avoid them.
The last time I tried Cinelerra in earnest was about two years ago. After about half a dozen crashes in an hour just trying to put together a slideshow-ish thing, I gave up and started using Kdenlive fairly successfully. But I still watch for updates to the Cinelerra packages. Given the number of updates I've seen over the past two years (very few), I'm not confident the warts have been addressed.
There are some nice things that Cinelerra (allegedly) does, and its timeline has a few advantages over Kdenline. If you know of some magical incantation that will get Cinelerra working crash-free, I will honestly give it another shot. But I'm not sanguine about the results.