When people hear Open Source they think FREE. Well it is free. It usually does not have all the features of the similar product that costs money but may be sufficent for your purpose. This website is build upon an open source product. Our bug tracking system is as well. Both using Microsoft Technologies such as the .NET Framework & SQL Database.
There are open source products for all platforms and needs. The question is does it fit your need and does it make sense to create a product from scratch or modify one that is open source. This decision must be made by you and we are here to best inform you of the pros & cons.