OpenX Technologies, an open source advertising community that helps online publishers make money, has just announced a $10.4 million third round of venture funding, bringing total investment in the company to nearly $31 million since mid-2007. The company's technology lets publishers manage a mix of ads from multiple networks across a web site, and competes directly with Google's Ad Manager. Palo Alto-based firm DAG Ventures led the round of financing, and GigaOm has more on OpenX's plans here. 

Recently, we covered research showing that nearly half of open source developers are focused on applications for delivery in the cloud. Software as a Service (SaaS) applications are increasingly either employing open source or are built entirely on it. And all of this adds up to an increasing premium on web development skills and good tools for web development in the open source community. The good news is that there are many  open source tools to help you with your web project, and given the costs of web development environments and the like, they can save you a lot of money. Here are over 15 good examples of tools and tutorials, with a few that we've covered before appended at the end, in case you missed them.

OpenX, the open source ad server for web publishers, is out with some very strong statistics today.  We've written about the company before, and how it lets you manage a mix of ads from multiple networks. While many have questioned how the small  company can compete with Google Ad Manager, there are some signs that it is doing an effective job, and many large sites, including TechCrunch, use OpenX. Here are some thoughts on the company's results.