ForgeWorldGen

ForgeWorldGen is a simple, lightweight Forge mod that lets you generate areas of a world without traveling there. Currently available for 1.7.10 (and maybe earlier 1.7s? No idea), with an experimental release for 1.11.2.

Commands

/fwg worldID lowX lowY highX highX
worldID: Which world to operate on, specified by dimension. 0 for the Overworld, -1 for the Nether, and 1 for the End.
lowX, lowY: The chunk coordinates of the northwestern corner
highX, highY: The chunk coordinates of the southeastern corner
The arguments use chunk coordinates, not block coordinates. To get chunk coordinates from block coordinates, just divide by 16.

Bugs

• There’s no limit to how many separate generation tasks you can have running at once. If you have a fast server machine, this might be a feature. ;)
• There’s no way to turn off the generation feedback spam. Either run generation jobs from the server console, reconnect, or deal with it.
• There’s no reasonable way to cancel a generation task. Restart your server to abort if you really need this.
• I don’t think there are limits on who can run the fwg command. I think it’s limited to ops by default, but you might want to check this.

Download

Downloads are available on the project’s releases page.