Workarea is a rails engine you can host yourself, I do integration work for retailers but the core of it is OSS. Lots of plugins, and they're easy to create.
> You may make production use of the Licensed Work without an additional license agreement with WebLinc so long as you do not use the Licensed Work for a Commerce Service.
doesn't that convert the license to "Version 2.0 or later of the GNU General Public License"?