Spawn Builder by Wuzzy
Generates a stone platform below the world origin or static spawn point.
Useful For Building
A collection by BlueBaritone21
Mods I find useful when I'm building in Creative
Packages
WorldEdit by sfan5
In-game world editor. Use it to repair griefing, or just create awesome buildings in seconds.
Better Screwdriver by 12Me21
A more intuitive node rotation tool
Modgen by BuckarooBanzai
mapgen mod creator