Apple iWork - iWork is an office suite by Apple.
Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.
Airborn - Create and edit documents online without sacrificing your privacy
Referral Candy - Run a fully automated, customizable and easy to integrate referral program for ecommerce.
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
InviteBox - Acquire new customers with a social referral program. InviteBox is a flexible referral marketing solution that brings you new customers at no cost.