The apple2.archive.umich.edu structure looks like this:

gs/  ............... All GS-Specific programs (won't run on a //e)
   comm/  .......... Communications/terminal emulators
   progutil/ ....... Utilities for programmers and hackers only
   util/ ........... Regular utilities (file/disk, etc)
   doc/  ........... Misc documentation
   graphics/ ....... Neat-o-keen graphics utilities & demos
       pics.3200/ ..  Pictures for 3200 color viewers
   shell/ .......... Programs for Orca and GNO shell
       src/ ........  Things w/source code
       exe.cmds/ ...  W/O source
   game/ ........... Games & demos
   sound/ .......... You know what sound is, don't you?
       digitized/ ..  Digitized sayings and noises
           binary/ .  Files too big to bother BSQ-ing
       soundsmith/ .  The music editor and some songs for it
       synthlab/  ..  Another music editor and songs
       program/ ....  Other Music & sound programs
       mod/ ........  The latest MOD players (cool music format)
   demo/ ........... Demo versions of products (some never released)
   archivers/ ...... Programs that compress and archive
   gsos/  .......... Add-ons to GS/OS
       cda/  .......  Classic Desk Accessories
       nda/  .......  New Desk Accessories
       font/ .......  Fonts
          editors/ .    Font editing programs
          fonts/  ..    Actual fonts (sparse--see Mac archive!)
       cdev/  ......  Control Panel Devices 
       fext/  ......  System 6 Finder Extensions
       driver/  ....  Printer Drivers
   hypermedia/ ..... Buzzword compliant Hyper programs
       hypercard /..  Stacks for HyperCard IIGS (HCGS)
       hyperstudio/   Stacks for HyperStudio

8bit/ .............. Apple //e (and some II+) programs
  appleworks/ ...... Enahacements and files for AppleWorks
  comm/  ........... Communications/Terminal emulators
     bbs/ ..........   Setup your own BBS. Just add a modem.
  game/  ........... Fun & games
  demo/  ........... Demo versions of products (some never released)
  docs/  ........... Misc documentation
  source/ .......... Source code, wonderful source code!
  graphics/ ........ Graphics viewers, converters and makers
  basic/  .......... Add-ons to AppleSoft
  archivers/ ....... Programs that compress and archive
  shell/ ........... Shell-like programs & launchers
    ecp8/ ..........   The ECP8 shell
  misc/ ............ Misc programs
  util/ ............ Utilities (disk/file/etc)

technotes/ ......... Straight from Apple
   tn/  ............  Technotes by type
   dts.source/ .....  Misc source for GS/OS
unix/ .............. Utilities for Unix to r/w BSC and SHK files
misc/ .............. Other..
  textfiles/ .......  Misc textfiles
  programmers/ .....  Code snippets & such for programmers
  game.stuff/ ......  Hacks and cheats for games
languages/ ......... Languages for the //'s
   forth/ ..........   FORTH - the only medium-level language
   c/ ..............   The classic
   assembler/ ......   The favorite hackers language
   pascal/ .........   Yes, Pascal
faq/ ............... The Frequently Asked Questions directory!