Businesses increasingly rely on real-time analytics to process vast amounts of operational and customer data, with open-source business intelligence (BI) tools gaining traction over proprietary platforms. The provided list highlights various open-source BI tools, such as BIRT for creating visualizations and reports, The ELK Stack for data centralization and real-time visualization, and KNIME for data analysis with extensive modules and algorithms. Other tools like JasperReports Server and Pentaho offer robust reporting and analytics capabilities, while platforms such as Microsoft Power BI and Tableau Public provide free versions for data visualization and sharing. The text also mentions Logz.io, which, although not open-source, enhances popular open-source monitoring tools by integrating them into a single SaaS platform, offering a comprehensive view of log, metric, and trace data.