Dan at the OpenScience Project tells about a new community driven project called Machine Learning Open Source Software. Mloss.org is devoted to open source software projects related to machine learning, algorithms, and statistics. The site is essentially an online software research journal. Mloss.org does a good job of explaining in detail the software projects. They also do a good job of maintaining citations to specific software projects so that the community of developers will maintain credit and recognition.
Machine Learning (wikipedia) is the science of applying algorithms and formulas to allow machines to learn based on given data or other input. This is a growing field as technology advances the processing power of computers.