Z-Matrix Generator for Gaussian I am looking for a way to convert XYZ coordinates into z-matrix for Gaussian input files. I need to specify certain coordinates in the matrix, therefore, the automatic built-in function from gaussview isn't of much help. Do you know of a program that can help me? 
Thanks in advance for your help!
Try Open Babel, the windows GUI has a lot of features that may be of help depending on what are those specifics you need in your Z-matrix.