Gumroad - An all-in-one solution to sell your work and grow your audience.
robora - Robora is a service which aims to help you sell anything, anyway you like.
Sellfy - Sellfy is an easy to use but powerful e-commerce platform where you can sell digital, print on demand or subscription products. Use a Sellfy storefront to create a beautiful online store or embed a Sellfy shopping cart to your own website.
Happeno - Online shopping from a big selection of books, magazines, music, DVDs, videos, electronics...
Zipsell - A free, open source platform for selling digital downloads
DuckSell - Sell your digital products on your own website