Google Developers Network

Google Developer Network is for external developers interested in Google-related development. It’s where we’ll publish free source code and lists of our API services.Some Google Open Source Project details can be found at http://code.google.com/projects.html but when logged in to your Google account you can start to enhance your website with an array of choices from embedding code on your site to making Google Gadgets

Yahoo Develper Network

The Yahoo! Developer Network offers Web Services and APIs that make it easy for developers to build applications and mashups that integrate data sources in new ways, making the web a more useful and fun place for everyone.And the greatest thing of all it’s free for everyone to use.They also have a developers blog worth reading.

Windows Mobile Develper Center

The place to start if your interested in using Microsfot products to create your next mobile application.Once there you can take part  by joining the communnity forums or by posting questions or comments on the Mobile Web Team blog. They have a complete list of downloads and support there as well as a great learning center for soon to be MSN Developers.

Cingular Developers devCentral

The first place to go when wanting to create Cingular Mobile Aplications once there you can log in to access documentation, developer gateways, web boards, support and more.

Bugzilla

Bugzilla is a “Defect Tracking System” or “Bug-Tracking System”. Defect Tracking Systems allow individual or groups of developers to keep track of outstanding bugs in their product effectively. Most commercial defect-tracking software vendors charge enormous licensing fees. Despite being “free”, Bugzilla has many features its expensive counterparts lack. Consequently, Bugzilla has quickly become a favorite of hundreds of organizations across the globe.