Porteus

I've found a couple: tube2go -- available as a "snap" or "flatpak" only?

Alternatively, Ktube which is available as .deb or .AppImage.

Other alternatives?

presuming you mean just gui type.. (see Howto: Popular AppImages one click away )

clipgrab for appimage (also in salix or sbo, but will need the webengine part of qt5)

Videomass appimage

QMPlay2 appimage and various slackware: https://slackware.nl/slakfinder/index.p ... e=#results