MONC supersedes LEM
The Met Office/NERC Cloud Model (MONC) is a large eddy simulation. It's predecessor was the Met Office Large Eddy Model (LEM). MONC includes all the LEM science, but is written in modern Fortran, using modern programming techniques. It is much faster than the LEM, much more scalable and can deal with larger domains.
MONC can be run on a variety of computers, for example Linux boxes, MONSooN and ARCHER.
MONC has a BSD license and can be accessed at the Met Office Science Repository Service.