OpenGrok - OpenGrok is a fast and usable source code search and cross reference engine.
GrepCode - GrepCode.com is a code search engine built by developers for developers to search and browse open...
Krugle - Krugle is the complete enterprise solution for search targeted to the development organization.
Insight.io - Best web-based IDE-like source code browsing and search tool
Codase - Codase is the leading source code search company with advanced source code understanding and xml...
Sourcegraph - Sourcegraph is a free, self-hosted code search and intelligence server that helps developers find, review, understand, and debug code. Use it with any Git code host for teams from 1 to 10,000+.