https://www.spigotmc.org/resources/lands-minecraft-land-claim-plugin-grief-prevention-protection-gui-management-wars-1-15-support.53313/updates

Lands is rising star of claiming plugins, you won’t regret it please add it, Lands have API btw.

You can find it’s repo at spigot page.

Plugin is abandoned by the author it seems as he's looking for someone to take over.