Source Code Browsing Tools?

Marco Sanvido asks: "I often look at source code (especially C, but this question is valid for other languages as well) and I have a really hard time in understanding how it works. Documentation is often missing or quite outdated, and the only way to see how the program works is to try to understand the source code. Which tools do you prefer to use for browsing and studying source code? So far I have used LXR for Linux, Eclipse for java, and CScope, but I'm not sure that these tools are the best solution." It's tempting to flood this question with answers for your IDE, but the key thing here is _browsing_, not _development_. What decent, lightweight programs would work well as source code viewers?

Comments

A couple of options

[plover]

If you're looking for really lightweight, run the code through a prettyprinter first. Pick the style you can most easily read. For example, I personally don't like K&R style, but that's entirely up to you.

If you're looking more for documentation of existing code, doxygen is great. It produces click-to-follow hierarchies, graphical pictures of trees, and can will intelligently display some of the comments it encounters. It can produce output in html, LaTeX, rtf, PS, PDF, and even man pages. And I know from experience that it can handle some pretty massive projects.

Re:The only option

[Alfred, Lord Tennyso]

Actually, real programmers use cat.