A mod to restore the far lands in Forge. This mod was made for 1.12.2, but this should work for any version.
This mod works by using ASM to directly patch NoiseGeneratorOctaves.class. In beta 1.8 and above, the following code below is used to fix the far lands:
k = k % 16777216L;
l = l % 16777216L;
By removing these modulos, we can allow the integers to overflow and add back the far lands!
While there are other Far Lands mods out there, this mod uses the quickest way to add back the far lands. The fact that we don't override anything and only change 2 lines means that we could potentially create the Far Lands in other dimensions as well!
For example, here is the far lands in Twilight Forest.
And here it is in planet Neptune (Galaticcraft extra planets mod)
Note that not all dimensions added support this far lands feature, as some use a completely different terrain generator.