BIRT (free BI suite) is an open source software project that provides the BIRT technology platform to create data visualizations and reports that can be embedded into rich client and web applications, especially those based on Java and Java EE. BIRT is a top-level software project within the Eclipse Foundation.
JasperReports (free BI suite) Server is a stand-alone and embeddable reporting server. It provides reporting and analytics that can be embedded into a web or mobile application as well as operate as a central information hub for the enterprise by delivering mission critical information on a real-time or scheduled basis to the browser, mobile device, printer, or email inbox in a variety of file formats. JasperReports Server is optimized to share, secure, and centrally manage your Jaspersoft reports and analytic views.
NextReports (free reporting tool) provides three, free open source utilities that support report creation using a variety of database platforms.
NextReports Designer is an application to design in-grid reports, using connections to most popular databases including Oracle, MySql, MSSQL, PostgreSQL, Firebird and Derby. NextReports Designer has an intuitive interface that makes report creation a quick and easy task.
NextReports Engine is a lightweight (330 k) Java platform development library which can be used to run NextReports inside applications. This library is very easy to use, reports can be integrated with just a few lines of code.
NextReports Server supports the scheduling of NextReports and Jasper reports and to automatically deliver reports via E-mail, FTP, SSH, Windows Share, WebDAV in most popular file formats (HTML, EXCEL, PDF, etc) or in real time dashboards.
Pentaho Community (open source BI suite) provides everything an organisation might need to address not only its reporting needs, but also data mining for predictive analytics applications. The skill level required to make it all work should not be underestimated, but this is the case with most open source solutions. Bells and whistles (Dashboards etc) require a move to the Enterprise Edition of Pentaho.
ReportServer (open source report server) provides an extremely flexible open source reporting and dashboard environment. It supports Eclipse Birt, JasperReports and SAP Crystal Reports reporting engines in addition to its own ad-hoc oriented reporting tools. The user interface is web based and it supports a wide range of admin tools.
SpagoBI (free BI suite) is essentially a very large collection of open source software brought together to create a broad business intelligence capability. In fact it goes beyond the traditional notion of BI to embrace domains such as data mining and BPM.