Tudmotu/gnome-shell-extension-clipboard-indicator is an open source project licensed under MIT License which is an OSI approved license.
Similar projects and alternatives to gnome-shell-extension-clipboard-indicator
Clipboard management system
A simple clipboard manager for Wayland
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Clipboard Manager extension for Gnome-Shell - Adds a clipboard indicator to the top panel, and saves clipboard history. (by RuiGuilherme)
Clipboard manager Fedora 34
reddit.com/r/Fedora | 2021-04-15
Here is the one which I use day to day, works great!reddit.com/r/Fedora | 2021-04-15
So apparently developer of this clipboard already ported the extension to Gnome 40. He is currently waiting for it to be approved.
reddit.com/r/linux4noobs | 2021-04-09
Clipboard Indicator isn't available on GNOME 40 -- Are there any good alternatives?
reddit.com/r/gnome | 2021-04-07
Clipboard Indicator already has a PR waiting to be merged by u/JustPerfection. Better just to patient than stocking up the apocalypse bunker a few weeks after each GNOME release.