The Syscoin protocol includes a fully-featured, entirely decentralised marketplace system with a powerful API allowing anyone to create their own desktop or web-based storefront, analytics view, or other interface.
Blockchain Foundry’s Blockmarket 3.0 is one example of a desktop application for Windows and OSX which provides a graphical user interface to the Syscoin decentralised marketplace. It allows users to buy and sell anything, to anyone, anywhere on Earth without middlemen, credit card fees, or interference.