Many of these have a Sponge equivalent, or a Forge port:
-
WorldBorder
AFAIK no plugins for pregeneration, however you can use vanila MC’s http://minecraft.gamepedia.com/World_border -
WorldEdit
WorldEdit for SpongeAPI -
WorldGuard
FoxGuard does a similar thing, [API 6.x/7.x] FoxGuard - The flexible world protection solution