Parcellite

Parcellite is a lightweight, tiny and free clipboard manager for Linux with a small memory footprint.

Fork
Since development of Parcellite has slowed, a fork of it, ClipIt has appeared. Developed by Cristian Henzel, it fixes numerous bugs and offers a better user experience, however the last commit was in 2018. Most importantly, it improves support for Unity AppIndicators, UTF-8, and adds support for GTK+ 3, last commit

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