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rustdesk
An open-source remote desktop application designed for self-hosting, as an alternative to TeamViewer.
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Stream
Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.
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If you are looking for a full open-source solution with open-source self-host server, try out https://github.com/dchapyshev/aspia, though not very polished
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Plasma, Sway, GNOME. You could probably take obs-xdg-desktop-portal or WayRec as examples on how to implement it.
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You can also try out this one, https://github.com/H-M-H/Weylus, this guy is very kindly.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.