Official YSlow Open Source Project Website. YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
Xen Project: Open Source Hypervisor, High Performance Clouds, Free Software, Open Source Virtualization, Open Virtualization, Cloud Computing, Desktop Virtualization, Mobile Virtualization, Embedded Virtualization
Xen Project: Open Source Hypervisor, High Performance Clouds, Free Software, Open Source Virtualization, Open Virtualization, Cloud Computing, Desktop Virtualization, Mobile Virtualization, Embedded Virtualization
2-plan Project Management Systems offers three PM tools: a free desktop system, an open-source software for multiple projects and teams, and a scrum board.
Asterisk is the world's most popular open source communications project that lets you create telephony apps for IP PBXs, VoIP Gateways and Conference Servers.