Zoho is another suite of online office tools you can use to collaborate with peers. The suite includes:

• Zoho Writer
• Zoho Sheet (spreadsheet)
• Zoho Show (presentation tool)
• Zoho Wiki
• Zoho Notebook
• Zoho Mail (collaborative groupware, something like a listserv)
• Zoho Business (a suite of tools, like single sign-on, telephonic support, etc.)
• Zoho Projects (project manager)
• Zoho CRM (customer relation manager, help desk)
• Zoho Meeting (Web Conferencing)
• Zoho Creator (Database Application)
• Zoho DB and Reports (Database Reporter)
• Zoho Planner
• Zoho Chat

Many of the above tools are free, but a few are "private" (fee-based). This is a great suite of tools that can be used to collaborate with peers from around the world.