OSSIM, the Open Source SIEM
AlienVault's open source SIEM project, OSSIM™, created in 2003, is the most widely used SIEM offering with over 195,000 downloads in 175 countries.
OSSIM provides all of the features that a security professional needs from a SIEM offering – event collection, normalization, and correlation. Established and launched by security engineers out of necessity, OSSIM was created with an understanding of the reality many security professionals face: a SIEM is useless without the basic security controls necessary for security visibility. OSSIM addresses this reality by providing the essential security capabilities built into a unified platform. Standing on the shoulders of the many proven open source security controls built into the platform, OSSIM continues to be the fastest way to make the first steps towards unified security visibility.
AlienVault provides ongoing development for OSSIM because we believe that everyone should have access to sophisticated security technologies; this includes the researchers who need a platform for experimentation, and the unsung heroes who can't convince their companies that security is a problem.