- Data Mining with SQL Server 2005
- Apriori algorithm using C# and silverlight
- gSpan: Frequent Graph Mining Package
- gpuminer: Parallel Data Mining on Graphics Processors
- Dice- A random library for data mining
- Data Mining SDK
- Neural Network Software
However, you can see there is one paper that introduce data mining tools, if you are interested in this introduction, just go to Open-Source Tools for Data Mining .