Desktop (windows&linux) + android :

Freetube

Grayjay

android only :

newpipe

tubular (fork of newpipe)

pipepipe (based of newpipe)

Browser :

Invidious ( the least reliable, probably the least 'private', best instance yet is inv.nadeko.net )

piped (never worked for me)

try them and see what suits you ( I use almost all of them 😆 )

some of these projects support more platforms other than YT.