Link to Homepage: https://openbazaar.org/
Is it Open Source: Yes!
Link to Source Code—Installer: https://github.com/OpenBazaar/OpenBazaar-Installer/archive/v1.1.7.tar.gz
Link to Source Code—Desktop Client: https://github.com/OpenBazaar/openbazaar-desktop 2.0 Version, above is 1.1.7 installer
*There is other software on GiHub by OpenBazaar, including the program to run a server for OpenBazaar if you're a vendor*
OpenBazaar is a new way to buy and sell goods and services online. By running a program on your computer, you can connect directly to other users in the OpenBazaar network and trade with them. The network isn't controlled by a company or organisation. OpenBazaar is a decentralised peer-to-peer network, which means there are no listing fees and the marketplace is censorship-resistant.
Goods and services are bought and sold on OpenBazaar using Bitcoin, a digital cryptocurrency that is decentralised and censorship-resistant. Transaction fees on the Bitcoin network are very cheap.