Heyo, not the first time ive done this, probably not the last.
Anyways, I have no idea about anything with bukkit, so i dunno if these have updated. sorry :3
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FalseBook/CraftBook
Soz no link, but i thik we've had it before if not, it adds special mechanics that enable the creation of gates, lifts, drawbridges, adn a buch of other stuff
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MineCal
http://forums.bukkit.org/threads/rpg-info-minecal-v0-4-an-in-game-calendar-system-1-1-r7-1-2-3-r0-2.14164/
Creates a system for players to keep track of the date/month ingame
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Tent
http://forums.bukkit.org/threads/fun-rpg-tent-v0-05-create-a-quick-house-quickly-1060.26834/
allows players to create instant shelters, that cannot be farmed!
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TrainCarts
http://forums.bukkit.org/threads/mech-traincarts-v1-60-link-minecarts-of-different-types-together-to-form-trains-2126.29491/
Makes it possible for us to make minecarts behave like trains
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BookWorm
http://forums.bukkit.org/threads/fun-mech-bookworm-v1-12-read-and-write-books-1-1-r8-1-2-3-r0-2.22159/
Allows players to write books then place them on bookshelves!
Perfect for the library at spawn!
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SMP_Hardcore
http://forums.bukkit.org/threads/fun-mech-smp_hardcore-become-ghosts-after-death-1-1-r7.59006/
I dont think this has updated but if it does update: Makes it so if you die you have to be revived by a friend, by placing an iron/gold block
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mcMMO
http://dev.bukkit.org/server-mods/mcmmo/
Makes minecraft like an RPG : ) adds a whole assortment of stuffs like skills