Avogadro should be able to deal with molecules that are represented in Internal (Zmatrix) coordinates, and also mixed Cartesian/Zmatrix representation.
It should alaso be possible to edit the coordinates in either representation and interconvert between them
Logged In: YES
user_id=1682851
Originator: NO
Avogadro uses OpenBabel to open files. This means that it allready has support for Z-matrix represented molecules.
A Z-matrix editor can easily be added with some additional code to avogadro (OpenBabel can convert between the two, code would be similar to the cartesian editor). I'll take a look at it this week.