The following sites provide access to most of the Free Open Source Software available on the Internet:
- Apache Software Foundation - Originally the source for the popular Apache web server. Now offers an array of Free Open Source Software web development services, including Java applications servers, frameworks, and application development tools.
- GitHub - Provides access through the GIT configuration management system to large amounts of FORSS
- Mozilla.org – Best known for the Firefox web browser. Also supports development of the Thunderbird email application and related components.
- The Document Foundation - The popular open system office suite, now called LibreOffice, including the Writer word processor, Calc spreadsheet, Impress presentation software, Base database manager, and related tools. Excellent interoperability with MS Office.
- Savannah - Central point for development, distribution, and maintenance of GNU software. See related Free Software Foundation focused on GNU policy and licensing.
- SourceForge.net – Supports tens of thousands of open source projects, including community organization and management tools to help teams develop their software. Many projects are Free Open Source Software, some are COSS.
The Ohloh site provides a good indexing system that rates open source and provides a range of useful metrics for helping choose software for a particular use.