If your employer uses Google Apps, you can now install new software from Mountain View’s business-centric catalog without the need of an administrator. To start digging around for new third-party apps to use, click More,” and select “More from Apps Marketplace.” While employees will have access to a stockpile of new applications by default, admins can fine-tune settings to display which apps are available to their staff.
However, companies operating from a K-12 EDU domain will still need to request access to third-party applications, which are disabled off by default. Available since spring of 2010, the Google Apps Marketplace is a hub that offers cloud-based apps that work with Mountain View’s in-house suite, like: Gmail, Docs, Calendar and Contacts.
(via Google for Work Blog)