BABEL is a program designed to interconvert a number of file formats currently used in molecular moldeling. The program is available for Unix (AIX, Ultrix, Sun-OS, Convex, SGI, Cray, Linux), MS-DOS, and on Macs running at least System 7.0.

BABEL will read the following file types: Alchemy AMBER PREP Ball and Stick; Biosym .CAR Boogie Cacao Cartesian; Cambridge CADPAC* CHARMm* Chem3D Cartesian 1; Chem3D Cartesian 2 CSD CSSR CSD FDAT*; CSD GSTAT Free Form Fractional GAS Output*; Gaussian Z-Matrix Gaussian Output* Hyperchem HIN*; Mac Molecule Macromodel Micro World; MM2 Input MM2 Ouput MM3*; MMADS* MDL MOLfile* MOLIN*; Mopac Cartesian Mopac Internal Mopac Output; PDB ShelX Sybyl Mol*; Sybyl Mol2* XYZ.

BABEL will write the following file types: Alchemy Ball and Stick Cacao Cartesian; CAChe MolStruct* Chem3D Cartesian 1 Chem3D Cartesian 2; ChemDraw Conn. Table* CSD CSSR* Gamess Input*; Gaussian Cartesian* Gaussian Z-matrix Hyperchem HIN*; IDATM Mac Molecule Macromodel; Micro World MM2 Input* MM2 Ouput; MM3* MMADS* MDL Molfile*; Mopac Cartesian Mopac Internal PDB; Report Sybyl Mol* Sybyl Mol2*; XYZ.

BABEL is capable of assigning hybridization, bond order, and connectivity when these elements are not present in the input file.