MortonFox.com
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twstat and twstat-web
twstat is a Ruby script that generates stats charts from a downloaded Twitter archive using Google Chart Tools. Twitter archives can be downloaded by clicking on "Request your archive" in your Twitter settings page. twstat generates charts for tweets by month, day of week, hour, top mentions, and top clients for both the last 30 days and all time. twstat also generates word clouds using jQCloud.
twstat-web is a Ruby on Rails wrapper around twstat that generates and hosts chart pages.