This directory hierarchy is sorted roughly, but not completely, alphabetically:

gui
- wxpython
  - core
  - dbmgr
  - gcp
  - gmodeler
  - gui_core
  - iclass
  - lmgr
  - location_wizard
  - mapdisp
  - modules
  - nviz
  - ogc_services
  - psmap
  - vdigit
  - wxplot
include
- iostream
- vect
lib
- arraystats
- bitmap
- btree
- btree2
- cairodriver
- cdhc
- cluster
- datetime
- db
  - dbmi_base
  - dbmi_client
  - dbmi_driver
  - sqlp
  - stubs
- display
- driver
- dspf
- external
  - ccmath
  - shapelib
- form
- gis
- gmath
- gpde
- gtcltk
- htmldriver
- imagery
- init
- lidar
- linkm
- manage
- nviz
- ogsf
- pngdriver
- proj
- psdriver
- python
  - temporal
- raster
- raster3d
- rowio
- rst
  - data
  - interp_float
  - qtree
- segment
- sites
- stats
- symbol
- temporal
  - lib
  - SQL
  - t.connect
- vector
  - dglib
  - diglib
  - neta
  - rtree
  - vedit
  - Vlib