I find that checking out these favorites, or top ten lists, or best of lists often times helps one get an idea of what’s available for these open source applications. In this case, here’s a few links to some lists ranking osCommerce contributions:
Here’s the official osCommerce Contributions page:
It seems much easier to navigate than their Add-Ons page which links from the Community menu:
Here’s the official osCommerce Top Contributions Downloads page:
That’s about it from what I see. Surprised there isn’t more of these types of lists (Joomla’s got a ton of them), but it’s a start. They all seem to point to the same basic contributions (wink wink), but even without the lists, jut going by the osCommerce Top Contributions Downloads page should give you an idea of what the most popular osCommerce contributions are.