Last night at Campfire One, Google launched the Google Apps Marketplace, where developers can create apps that integrate with Google Apps and sell them to users. According to Google, they can reach over 2 million businesses and 25 million users.

Right off the bat, the Google Apps Marketplace launched with over 50 applications from companies like Intuit and Atlassian, with more coming soon from companies like NetSuite and SuccessFactors, a Google spokesperson tells WebProNews.

"Once installed to a company’s domain, these third-party applications work like native Google applications," explains Google Apps Marketplace Product Manager Chris Vander Mey. "With administrator approval, they may interact with calendar, email, document and/or contact data to increase productivity. Administrators can manage the applications from the familiar Google Apps control panel, and employees can open them from within Google Apps. With OpenID integration, Google Apps users can access the other applications without signing in separately to each. The Google Apps Marketplace eliminates the worry about software updates, keeping track of different passwords and manual syncing and sharing of data, thereby increasing business productivity and lessening frustrations for users and IT administrators alike. That’s the power of the cloud."

This is the 2nd big move by Google regarding the cloud and Google Apps in less than a week. Late last week, the company acquired DocVerse, which "makes Word, PowerPoint and Excel Work like Google Docs," as the DocVerse title tag explains.

Developers can get more info about the Google Apps Marketplace at Google’s Developer Programs site. The company will also be talking about developing apps for the enterprise at Google I/O in May.