There are thousands of Big Data tools out there for data analysis today. Data analysis is the process of inspecting, cleaning, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision making. To save your time, in this post, I will list 30 top big data tools for data analysis in the areas of open source data tools, data visualization tools, sentiment tools, data extraction tools and databases. Open Source Data Tools 1. Knime KNIME Analytics Platform is the leading open solution for data-driven innovation, helping you discover the potential hidden in your data, mine for fresh insights, or predict new futures. With more than 1000 modules, hundreds of ready-to-run examples, a comprehensive range of integrated tools, and the widest choice of advanced algorithms available, KNIME Analytics Platform is the perfect toolbox for any data scientist. 2. OpenRefine OpenRefine (formerly Google Refi...