"Despite the minor-sounding version number, Interchange 4.6 is a
major change from prior releases. The package, which shipped in
October, is actually a merger of Akopia's two storefront packages:
Tallyman, which has good graphical management tools but weak
shopping features, and MiniVend, which has a feature-rich shopping
engine but no graphical administration tools whatsoever."
What a difference good tools make! Interchange 4.6's graphical
administration tools... are comprehensive and professional, with an
easy-to-navigate layout and online help."
"Interchange is distributed using the open-source GNU General
Public License (and therefore is free to download and use) and is
written in Perl. Akopia offers technical support, hosting services
starting at $300 per month, and custom installation and programming
contracts starting at a few tens of thousands of dollars."