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I'm trying to obtain an electron density from orbital information written in the Molden format by the formula, $$ \rho(\mathbf{r}) = \sum_{i}^{occ} |\phi_{i}(\mathbf{r})|^{2}. \tag{1} $$

Is there any post-processing program to handle this job?

I believe that I can make a script on my own, because the Molden file seems to provide coefficients of GTO, but want to check if there are already working examples.

It would be desirable that the final density function data is in the format compatible with usual visualization software (such as Molden, VMD, etc.), but I think that it can be visualized if it is represented in a 3D grid.

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I highly recommend cclib which can read Molden and calculate the Density.

While I haven't used them as much, I'm pretty certain you can do this with:

There are undoubtedly other tools - Molden is a pretty standard format for quantum chemical interchange.

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    $\begingroup$ Thanks for answering this for the user so quickly even during the holiday period! The leader of the HORTON project (Paul Ayers) has participated on this site in the past so perhaps we could get more insight now that you've got the ball rolling. $\endgroup$
    – Nike Dattani
    Dec 27, 2020 at 21:07

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