Assisted Model Building with Energy Refinement

A program and a force field, see http://amber.scripps.edu/

Capitalization varies, but Amber seems to be displacing AMBER over time.

For the Amber force field in CHARMM format see http://www.chpc.utah.edu/~cheatham/software.html

In NAMD 2.5b1 and earlier there were issues with using rigid waters in NAMD with Amber-format toppar and coord input files. This should be fixed in 2.5b3 and later, but a workaround is given at http://structbio.vanderbilt.edu/archives/amber-archive/2003/1033.phtml