Viart is a professional development company based in the UK who have an office and a number of staff. I believe the same goes with Avactis Software. Magento has a team as well and they have a professioanl edition you can purchase. All three are not back yard operations.
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It uses the same php scripting as most OS packages but without the available mods. If it works for you great. | |  | |  | |
If your talking about the current Open Source systems yes I believe this to be the case.
Magento is an entirely different setup.
As explained above I have spent many days researching installing and playing with different systems and personally on a professional basis Viart and Avactis are the two best packages going around and are the only two systems I will use when setting up new ecommerce websites for clients.
Avactis has less features than Viart but is powerful as well and I think will do nicely for a T Shirt Biz.
Viart has a free edition for 50 items and the basic system is only $149. Viart also has an editon which I use which has a helpdesk, forum for $349 and its all in one.
Good luck with it all.
I hope this helps.
Joe