Google Apps is a service from Google for using custom domain names with several Google products. It features several Web applications with similar functionality to traditional office suites but far superior on collaboration features, including: Gmail, Google Calendar, Docs and Sites.

Gmail

Gmail for business offers 25 GB of storage per user, powerful spam filtering, BlackBerry and Outlook interoperability, and a 99.9% uptime SLA.

Google Calendar

A web-based calendar application that enables employees to work together efficiently and helps minimize costs and IT hassles.

Google Sites

Google Sites is an easy way to create secure web pages for intranets and team projects. No coding or HTML required.

Google Docs

Web-based documents, spreadsheets, and presentations that let users edit the same file at the same time so you always have the latest version.

Google Video

Google securely hosts and streams your videos, so employees don't need to share videos over email, or burden IT with a complex on-site video solution.

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Google Groups

Google Groups can be used as mailing lists and to share calendars, docs, sites, and videos easily with co-workers.