At the first AnalyticsCamp, someone asked about free tools for analytics. This list is a living document meant to answer that question (some of these tools are entirely free; others have free entry-level accounts). If you have a favorite, free tool that isn't listed, please add it. Add new categories if needed.

Free tools

Web analytics

• Clicky
• Crazy Egg - website heatmaps
• Five Second Test - web usability test
• Google Analytics
• Quantcast - competitive media measurement, hybrid model if you carry their tag.
• StatCounter
• Tynt - see what content users are copying from your site, track clickbacks

Social media analytics

• Klout - Twitter influence

SaaS BI Tools

• Bime
• GoodData
• In2Clouds - predictive analytics for SalesForce
• Youcalc - Ad-hoc reporting for 140+ SaaS systems
• Zoho Reports

Statistics Programs

• R - free software for statistical computing and graphics

Data Visualization

• Many Eyes (IBM)
• Tableau

Other lists

• Monitoring Social Media Before You Have a Budget
• The Impoverished Social Scientist's Guide to Free Statistical Software and Resources
• Software for Data Mining, Analytics, and Knowledge Discovery, KDnuggets
• 85 Twitter Tools, Andrew Lennon