Just submitted a patch to #Guix adding Sourcetrail[1]! (PR #1129 [2]) It's a cool little tool and it was fun packaging it. Walking around a C/C++ project with a graphical tool is a great way to try and get a handle on what the big important functions and data structures are.
[1] https://github.com/OpenSourceSourceTrail/Sourcetrail
[2] https://codeberg.org/guix/guix/pulls/1229
