Made-for-fun mod that adds "placeable-off-grid" flag to every entity in the game.
Large total conversion mods.
Map generation and terrain modification.
Just a heads up that this mod will break in 1.1: https://forums.factorio.com/viewtopic.php?f=30&t=82294
That should be an easy fix and can even be applied by a user. I'll prepare update on github so new version for 1.1 will be released as soon as possible, thanks for informing me :)