Related link: http://wwwac.org/main.html#ossig
The motivation for using Open Source products came from within Sesame Workshop and it was not ideological — it was financial. The ongoing costs of licensing and maintenance for StoryServer, Oracle, and their Sun hardware was too much to bear, especially with a decreased IT staff.
In 4 or 5 months, Sesame Workshop’s sites were rebuilt using PHP and PostgreSQL, running under Apache and Linux on Intel-based hardware. The new sites also use add-ons popular in the PHP community: PHP Accelerator for caching compiled scripts, JPCache for caching generated pages, and ADOdb for database access and query caching.
The success of this project is a reminder that ideology aside, sometimes Open Source is just better for the bottom line.