Looking for interesting trends in your customer data? As OkCupid discovered, you can accomplish a lot with Microsoft Excel. Here are some other tools that can help.

This open-source statistical analysis software includes built-in tools for creating charts and graphs.
Price: Free

Datameer Analytics Solution
Businesses use this application to analyze very large data sets.
Price: From $500 a month

SAS Analytics
SAS's software includes tools for data mining and statistical analysis as well as forecasting trends.
Price: From $8,100 a year for one user

Google Chart API
Google's Web-based tool allows users to create charts and graphs that can be easily embedded into a website.
Price: Free