Create Pivot Tables!
If you want to get started using the tool, visit the GitHub repository. That page has all of the usage documentation along with pre-compiled binaries.
But I also wanted to demonstrate what the tool does. So this web page allows you to configure settings for your pivot table. You can see the command you'd have to run, you can see the output you'd expect to get as an HTML table, and you can download the actual CSV file.
Note that this is primarily a tool to display the workings of clipivot. Its performance is quite poor, and you are likely to run into memory issues if you try to run especially large files on it.