Full-featured open source office productivity suite, featuring word processor, spreadsheet, presentation, drawing and database packages; free MS Office replacement.
Picasa is software that helps you instantly find, edit and share all the pictures on your PC. Picasa also makes advanced editing simple, and makes it easy to share your pictures; you can email, print photos home, make gift CDs, and even post pictures.
Social networking for non-social purposes with a focus on professional development, networking for jobs and problem solving through the expertise of those in your extended network.
The Social Source Commons is a “knowledge commons” that provides users with: a directory of software applications; links to relevant documentation, localization tools, services, user reviews; and a place to request tools/features.
Change.org is a social network for hundreds of social causes and over 1 million nonprofit organizations. Good petition support and an excellent place to build up organizational mailing lists.