Want to have a windmill in Minetest? One with sails that really look like a windmill and which rotate? That's what this mod is good for. Nodes with signlike and plantlike as drawtype support visual_scale. That allows for animated images to be shown at larger scale. This is especially useful for windmills, watermills (to a degree!), large tv screens etc.
There are many windmill types available:
Sample windmill - the wings/rotor blades are animated and rotate:

The same animation acting as a watermill:
The classic:

If you want it to rotate counter-clockwise, just craft the sails alone:

There may not always be enough wind, and you may wish your sails to be idle:

Modern rotors can be crafted like this:

There's also a 4-blade-version of the modern blades available:

Farms sometimes seem to be equipped with these:

If the normal classic sails are too small for your mill, consider these:

The 4-blade-version is also available in a large version:

This may be helpful for making a visual connection between rotor and rest of the structure:

Added a larger version of the historic windmill and the idle one. The windmill sails are 20 nodes in diameter, and the media files are larger. It's nothing for servers but may enrich your singleplayer world.
The animated textures have all been done by VanessaE.
Download: https://github.com/Sokomine/windmill/zipball/master
Browse code: https://github.com/Sokomine/windmill
Version: 1.0
Licence: WTFPL for textures and code (code is more like sample code)
For the larger Version (do not use that on servers! The media files are large.):
Download: https://github.com/Sokomine/windmill_la ... all/master
Browse code: https://github.com/Sokomine/windmill_large