Mod by GTNewHorizons
Project Blue from greg.ewing. Original site at https://www.cosc.canterbury.ac.nz/greg.ewing/minecraft/mods/ProjectBlue/
The files of its newest release, on GitHub.
Have a copy of ProjectBlue? Check that it is the official one.
Drop it here. We compare its fingerprint with the official ProjectBlue files. If we do not know the file, we upload it for a deep check.