osCommerce was started in march of 2000 in Germany by the founder and leader of the project Harald Ponce de Leon as The Exchange Project. The last stable version is 3.0.2 was released in August of 2011.
What is it
osCommerce is a open source software for the development of e-commerce. It is available in multiple languages, it allows the adding of several modules adjusted by the community and is entirely customizable.
Developed as as open source software it is under the GNU public license, it is currently one of the most popular solution for e-commerce with over two haundred thousand store owners and developers support the project and helping each other.
Oficial Site: http://www.oscommerce.com/