The PLUMED manual
Here you can find the user manuals for currently supported and old versions of PLUMED, along with a manual of the PLUMED GitHub master branch (development version).
Documentation for recent releases
Documentation for development version
Documentation for previous, unsupported releases
Here you can find a list of papers containing practical PLUMED tutorials:
Barducci A., Pfaendtner J., Bonomi M. (2015) Tackling Sampling Challenges in Biomolecular Simulations. In: Kukol A. (eds) Molecular Modeling of Proteins. Methods in Molecular Biology (Methods and Protocols), vol 1215. Humana Press, New York, NY