Dear Francis,
Unfortunately it seems like all the solutions insofar are
> only commercially available as part of large packages that don't list
their prices directly on the website and, therefore, are probably too much for a single person to afford for just this purpose.
As mentioned in a private mail - you (and anyone else) might try rsv_mapper.py which is in the ImageD11 package at fable.sourceforge.net. It is free, opensource, and transforms a series of images into a 3D reciprocal space volume that you can slice as you like. Beware that your computer should be big enough to hold the resulting volume, and you need a deep understanding of crystallography to do cell transformations when choosing a basis for the volume.
Please just send me an email if you need help to get started (eg you didn't collect data at the beamline where I work :-) If there is some general interest I guess a user manual could be written with some examples.
Best, Jon
