4 open source tools that got my startup off the ground: 
When I started my first company, money was tight. We had a small office and a couple of computers, but not much else. I’d done all my cost planning without even thinking about business licenses and software costs. I know it was a mistake, but it can be easy to treat these sorts of things as an afterthought.
read more: Opensource.com PeterEllington
Supporting Open Source.
Have you tried: Diving with Sharks?