reading code

What tools are there to help understand large Racket programs?

I'm trying to grok the innards of Pict3D, which is, I believe, typed 
Racket.

But I have difficulty finding bindings of symbols across many complex 
require's and provide's through many directories of source code.

I'm looking for tools that work on a Linux system.  I know that in 
principle I could install something like Microsoft's big fat 
development environment (which may have a plugin for Racket)
but it would surpise me if there wasn't something relevant within the 
Racket ecosystem.

If DrRacket already does this, I haven't found it.  It does lovely 
graphics do show bindings, but I don't see how to follow those lines 
even to parts of the same file that happen to be out of the window 
area, let alone to other files.

Does DrRacket also show the types of symbols or expressions in typed 
Racket?

-- hendrik

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