World Borders: Nucleus - Its a very multi purpose plugin. Can also pregen worlds.
ClearLag: There are currently 2 options for this: ClearMob (I support this one myself) and CatClearLag, ClearMob can also do a lot of things EntityWatch can, I am also open to adding new features.
PurpleIRC: CraftIRC (Ill admit I know nothing of this plugin)