Google Search is the most used search engine on the planet, with approximately 900 million unique visitors each month.
Google Docs, or Google Drive, is an online equivalent of Microsoft Office that can be used to store files in a cloud and share documents among multiple people to be edited by them.
Google Sites is a free, easy to use tool designed to enable people to create websites without any knowledge of more in depth features.
Slide Rocket lets you create presentations online and share it with other people with a gmail account. Here is a link to simple instructions for opening and using it.