Flexible open-source content management and blogging software with an active user and developer community and a wide variety of plug-ins or extensions available.
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.
Upcoming.org is a social event calendar, completely driven by people like you. Manage your events, share events with friends and family, and syndicate your calendar to your own site.
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.