Source Insight - Source Insight is a programming editor & code browser with built-in live analysis for C/C++, C#, Java, and more; helping you understand large projects.
OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
Understand - Combines a powerful Code Editor together with an impressive array of static analysis tools that will change the way you work with code.
GrepCode - GrepCode.com is a code search engine built by developers for developers to search and browse open...
SonarQube - SonarQube, a core component of the Sonar solution, is an open source, self-managed tool that systematically helps developers and organizations deliver Clean Code.
Krugle - Krugle is the complete enterprise solution for search targeted to the development organization.