Gabedit

Gabedit is a free graphical user interface for computational chemistry packages.

Gabedit makes using Computational Chemistry Packages (CCP)  simple and straightforward :

The computational chemistry packages supported by Gabedit are : Gamess-US, Gaussian, Molcas, Molpro, MPQC, NWChem, MOPAC, Orca, PCGamess and Q-Chem.

ADF, ErgoSCF and other softwares (through the gabedit and molden format files) are partially sopported by Gabedit.