I am addicted to PhotoAcute
TAKE BETTER PHOTOS, reduce noise, increase quality and resolution of digital photographs. Leading superresolution technology.
They do DoF stacking and
much more (actually
everything you can do with an image series).
The price is $49. But you get it for free (the Professional license) if you contribute a lens profile. The DA40Ltd. profile is mine
EDIT:
I don't know about Helicon but most focus stacking software (incl. PhotoAcute) may have a problem with "look-through" foreground objects (like a bicycle wheel).
EDIT2:
I have taken the 37 input images from the Fly Eye sample of the Helicon website and restacked using PhotoAcute. While I am sure the Helicon did stacking on large photos (while I only had the thumbnails to run through PhotoAcute), the result is almost as good (except for some slight Moirč due to the smaller input images).
First attachment: Helicon
Second attachment: PhotoAcute