Name of the plugin you want: Dungeons
Spigot Link: https://www.mc-market.org/resources/16339/
Price: 7.49 USD
How it would contribute towards the betterment of the community: it would allow users to create very cool dungeons to have a unique experience compaired to free versions of dungeons.
Id really like this plugin leaked! https://www.mc-market.org/resources/14448/
Price: 11.99 USD
How it would contribute: it would add alot of cool and fun mobs to fight in minecraft.