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YouTube client alternative
(lemm.ee)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
in general, an application can allow you to log in to do things like like and comment, but most applications choose to instead. Comments might be a bit more tricky, but applications like smart tube next support liking and disliking.
It could also be possible to do what grayjay does, and simply open a webview for the video in question