The Google Apps Marketplace offers products and services designed for Google users, including installable apps that integrate directly with Google Apps. Installable apps are easy to use because they include single sign-on, Google's universal navigation, and some even include features that integrate with your domain's data.

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Try popular & notable apps

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Acunote - Scrum, Agile and IT Project Management, Wiki (Free for 5 Users)
Enterprise online project management and Scrum software. Manage projects, products and requirements, track project progress, accurately predict completion dates and analyze company productivity.

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Zoho Invoice - billing, invoicing & expense tracking
Zoho Invoice is the best way to invoice your clients and get paid fast. It makes invoicing and following-up really easy so that you spend less time billing and more time on your business.

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Solve360 :: CRM Meets Project Management for Serious Business
Solve360 is a modern CRM that integrates features to manage client projects. It's ideal for small teams in service based companies that need a flexible solution.

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Google Apps File Audit Tool
Scan all Sites, Documents and Calendars at your domain and see exactly who has access to your information.

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Gantter Project
Gantter.com is a powerful, web-based Project Management Tool that requires no software to be installed and it completely integrates with Google Docs.