SQL-Ledger® is a webbased ERP system which runs on any *NIX, Mac or Windows platform. Accounting data is stored in a SQL database server, for the display any text or GUI browser can be used.
PostBooks is a full-featured, fully-integrated Accounting, ERP, and CRM system, the core of the award winning xTuple ERP Suite. Built with the open source PostgreSQL database, and the open source Qt framework for C++, it provides the ultimate in power and flexibility for a range of businesses and industries of any size. (reference)
Jaspersoft is the leader in open source Business Intelligence.
JasperReports is the world's most popular open source reporting engine. It is entirely written in Java and it is able to use data coming from any kind of data source and produce pixel-perfect documents that can be viewed, printed or exported in a variety of document formats including HTML, PDF, Excel, OpenOffice and Word.
Joomla is a free, open-source content management system (CMS) and application framework that powers 2.7% of the entire web. With a vibrant volunteer community, user-friendly features and plenty of power.