../
[+] addon/
[+] audio/
[+] badguy/
[+] collision/
[+] control/
[+] editor/
[+] gui/
main.cpp
[+] math/
[+] object/
[+] physfs/
[+] scripting/
[+] sprite/
[+] squirrel/
[+] supertux/
[+] trigger/
[+] util/
[+] video/
[+] worldmap/

What is this ?

This is an online code browser that allows you to browse C/C++ code just like in your IDE, with semantic highlighting and contextual tooltips that show you the usages and cross references.
Open a C or C++ file and try it by hovering over the symbols!
Or take the feature tour.