zPermissions is primarily an SQL database-backed Superperms (aka Bukkit permissions) implementation. It also supports flat-file storage. Notable features are: multi-world support, ranks with multiple tracks/ladders, group inheritance of arbitrary depth (within reason), and optional region-specific permissions using WorldGuard regions, Residence residences, Factions territories, or Factoid lands.

Plugin Link:

https://www.spigotmc.org/resources/zpermissions.11736/