| Year | Version | Developments | Releases |
| 1991 | CHARMM 22 | c22.0.b c22.0.b1 | |
| 1992 | c22 c22g1 c22g2 | ||
| CHARMM 23 | c23a1 c23a2 | ||
| 1993 | c23f c23f1 c23f2 | ||
| 1994 | CHARMM 24 | c24a1 c24x1 c24a2 | c23f3 c23f4 |
| 1995 | c24a3 | c23f5 | |
| CHARMM 25 | c25a0 | c24b1 | |
| 1996 | c25a1 c25a2 | c24b2 c24g1 | |
| 1997 | c25a3 | c24g2 | |
| CHARMM 26 | c26a1 | c25b1 | |
| 1998 | c26a2 | c25b2 | |
| CHARMM 27 | c27a1 | c26b1 | |
| 1999 | c27a2 | c26b2 | |
| CHARMM 28 | c28a1 | c27b1 | |
| 2000 | c28a2 c28a3 | c27b2 c27b3 | |
| 2001 | c28a4 | c27b4 | |
| CHARMM 29 | c29a1 | c28b1 | |
| 2002 | c29a2 | c28b2 | |
| CHARMM 30 | c30a1 | c29b0 c29b1 | |
| 2003 | c30a2 c30a2x | c29b2 | |
| CHARMM 31 | c31a1 | c30b1 | |
| 2004 | c31a2 | c30b2 | |
| CHARMM 32 | c32a1 | c31b1 | |
| 2005 | c32a2 | c31b2 | |
| CHARMM 33 | c33a1 | c32b1 | |
| 2006 | c33a2 | c32b2 | |
| CHARMM 34 | c34a1 | c33b1 | |
| 2007 | c34a2 | c33b2 | |
| CHARMM 35 | c35a1 | c34b1 | |
| 2008 | c35a2 | c34b2 | |
Development Logs and Release Notes