I’ve heard of piped due to the piped-link bot, but I am curious about others.
Web
For the web, there is Piped (github.com/teampiped/piped) and Invidious (invidious.io)
NOTE: Only Piped proxies your videos, which means invidious allows connections directly to Google to load the video.
Android
On Android, there’s NewPipe and LibreTube which are well known by now.
NOTE: LibreTube uses Piped to preserve privacy and (somewhat) anonymity when watching, thus you’ll need to select some piped instance with it.
iOS
On iOS, there’s the web frontends and Yattee (github.com/yattee/yattee).
NOTE: Yattee is on the AppStore, but without any sources/instances by default. Look for “instances” in the settings and add a Piped API URL, like
https://pipedapi.kavin.rocks
to watch videos from YouTube with Piped+Yattee.
Desktop
On Desktop, there is all the web clients as well as FreeTube (freetubeapp.io).
NOTE: FreeTube has an option to proxy everything or just the videos through Invidious to preserve privacy. It is recommended to enable this.
Just want to add to your yatte this source/instance this gives you a lot of instances to start with so you don’t need to add them manually.