A free course management system (CMS) to create online learning sites
Cerberus Content Management System
Multiple server/webapp vulnerability scanner
phpBB is the world's leading open source discussion forum software.
An open source search engine with RESTFul API and crawlers
Modular and flexible PHP cms/framework
Discuz - мощнейший движок форума
An OpenSource (C# .NET) TeamPlay Environment.
Discuz!X3.1 - русская локализация.
Application Development
Performance and stability
Full cross-tech development suite