Indexing and Presenting Source code

Question

I am looking for software tools similar to lxr (open source and free if possible)

Answer 1

lxr is not open sourcy enough =) ? Try ctags, cscope, ViewVC or OpenGrok.

Answer 2

doxygen at www.doxygen.org gives you a browsable view of your code, complete with class diagrams

Answer 3

Not free, but a language-sensitive source code search engine can be found at SD Source Code Search Engine. It can handle many languages at the same time. Searches can be performed for patterns in a specific langauge, or patterns across languages (such as "find identifiers involving TAX"). By being sensitive to langauge tokens, the number of false positives is reduced, saving time for the user. It understands C, C++, C#, COBOL, Java, ECMAScript, Java, XML, Verilog, VHDL, and a number of other languages.