Search products across independent online shops. Read-only; links go to each shop's own page.
Free
One server, in e-commerce. Search products across independent online shops. Read-only; links go to each shop's own page.
E-commerce
Search products across independent online shops. Read-only; links go to each shop's own page.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.