Data mining essentiially is sorting through large amounts of data to parse out the relevant information. Originally this process of analysis was exclusively under the purvey of business management or information managers. More recently, science disciplines have turned to Data mining as a tool to grasp meaning from the large amounts of data produced by current e-science initiatives.
These tools are for Data Visualization. Data Visualization is the process of graphicaly presenting your data. Some simple examples of data visualization are pie charts and mind maps. Data visualization tools are often used in conjunction with data mining tools.
These are some tools that are designed to provide solution for problems unique to chemistry practitioners.