Google Inc. (NASDAQ:GOOG) has released some stats about the Apps Marketplace. About 4 million Google Apps users have downloaded at least one Marketplace app and installed it on their domain. Google launched the Apps Marketplace back in March.

The Google Apps Marketplace are services that were designed for Google users to integrate into Google Apps.  The paid and non-paid apps are easily accessible since they include single sign-on and universal navigation.  Below are 10 applications that are worthwhile checking out if you are a small business.

Google Inc. (NASDAQ:GOOG) had an event at the company’s headquarters in Mountain View, California today called Campfire One.  At the event, Google launched a service called Google Apps Marketplace.  

The Google Apps Marketplace is an app store that is integrated with Google Apps.  Developers would be allowed to sell software directly to Google’s business consumers.

- Developers will charge a $100 flat fee no matter what the amount of apps a developer will sell.  Developers will share 20%

- There are over 50 partners with Google Apps as of right now including Aviary and Intuit.

- Google allows users to log in to third party apps using OAuth.

- All apps will be available starting tonight.

[Mashable]