Bukkit

Cobblestone Generators will create ores as well as cobblestone

Powerful and full automatic SurvivalGames with an own WorldGen.

Support JAR for the TARDIS plugin

skySMP+ - SkyBlock survival multiplayer implementation.

A chunk pregeneration plugin for Spigot (and paper) servers.

Dwarven Delight

The Best Plugin for Integrating Adventure Maps onto your Server

MCGPLuSGen

SkyBlock Made Easy! No setup needed.

Creates a slightly less boring flat world for creative

Islands

WorldWarp - No BS, Pure MultiWorld!

This mod Spawn Random Structures every minute.

Generates a SethBling SkyGrid map

CustomOreGen

Temporary discussion page/forum & hopeful placeholder

Generates a world full of planets

this mod make pixel art by only one command

Sky Island Generator

Jump in to the Whooshing Well and be whisked away to a far away land