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I use ido-mode for file browsing, and semantic for code browsing. etags will get you quite far, semantic-symref gets you the rest of the way (though you can use cscope instead, through xcscope.el). ECB can be helpful but I don't find I need it much anymore, and it's pretty out of date.

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I use ido and imenu to jump around, but this is for when you already know what's where and how it all fits together.

What about when you download some library from Github and want to quickly get an idea of how it all works?

I use github, and mostly the t browser shortcut

(yo hassy)

This may not be exactly what you're looking for, but I generally resort back to good old 'git grep / grep' when looking through unfamiliar github projects. running grep from emacs links all the matches to their corresponding files, so you can navigate the results and easily follow the code execution by jumping to each result.

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