Spark is an open source cluster computing system that aims to make data analytics fast — both fast to run and fast to write.

A software companion to a 30+ year-old CIA research methodology, Open Source Analysis of Competing Hypotheses (ACH) will help you think objectively and logically about overwhelming amounts of data and hypotheses. It can also guide research teams toward more productive discussions by identifying the exact points of contention.

Piwik is a downloadable, open source (GPL licensed) real time web analytics software program. It provides you with detailed reports on your website visitors: the search engines and keywords they used, the language they speak, your popular pages… and so much more.

Piwik aims to be an open source alternative to Google Analytics.

Analysis of data gathered from 210 million Facebook profile.

Graphviz is open source graph visualization software.

A free yet reliable invisible web tracker, highly configurable hit counter and real-time detailed web stats.

StatSVN retrieves information from a Subversion repository and generates various tables and charts describing the project development

Mint is an extensible, self-hosted web site analytics program.