Google Apps Marketplace is a product of Google Inc. It is an online store designed to help people and organizations to discover, purchase, and deploy integrated cloud web applications that work with Google Apps (Gmail, Google Drive, Google Sites, Google Calendar, Google Contacts, etc.) and with third party software. Some apps are free, some are paid for. Apps are based on Google APIs or on Google Apps Script. Google Apps business administrators can manage a single directory of both users and applications from the same unified interface as Google Apps, reducing overhead and improving security. It also serves as a directory for professional services related to Google Apps.