HEATKEYS

phpScheduleIt is an Open Source web-based resource and reservation scheduling system. It provides management of unlimited reservations on unlimited resources of any kind.

SourceForge.net. Fast, secure and free downloads from the largest Open Source applications and software directory

Zimbra provides open source email and calendar groupware software, Zimbra is a popular choice for Linux and Mac OS X email servers and supports SaaS deployment, appliances and virtualization platforms.

Web.AppStorm is a blog all about Web apps. It features reviews, roundups and how-tos as well as giveaways and more!

SitePoint.com - With a vast variety of web design tutorials and articles coupled with a vibrant and well informed community, SitePoint the natural place to go to grow your online business

Linux.com - For the community, by the community, Linux.com is the central source for Linux information, software, documentation, how-tos and answers across the server, desktop/netbook, mobile, and embedded areas.

Review, Compare and Evaluate business applications. In Getapp.com you will find enterprise software, SaaS and Cloud Computing solutions with user reviews

Simple application deployment from development to production

An online computer dictionary and internet search engine for internet terms and technical support.

- Hunting the Best Open Source Resources for Web Developers | WebAppers