I'd like to allow some users to sell products in my store, without giving them access to magento's back end.
Is there any extension for doing that ?
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This functionality is commonly known as an online marketplace. There are a number of extensions that do this, the most popular of which by far is Unirgy Dropship. It is an expensive, commercial, solution.
This has been covered a few times here before:
If you want a freebie, I just installed this one.