One of the biggest strong suits of bukkit and spigot is the amount of land protection resources there were, from world guard to grief prevention (those two being the primary used on servers) I think this is a very important plugin category and is lacking. I alone don’t have time to create this, however if someone wants to help, or rather make one on there own please do!
Worldguard is being ported to Sponge 
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I believe grief prevention is being ported as well, but with the current state of Sponge neither are ready
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Prism is being actively ported, for what it’s worth. Not (well, mostly not) active protection, just logging.
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