Apple // emulator disk images can be found here.

. To find a particular title, download and search through the
  /site_index.txt file.  It is updated daily.
. If you find a corrupt/unworking image, or come across any
  other problem, please drop a note in the /incoming dir. 

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If you have original Apple // disks, and you wish to
have them converted to image format, please do the
following:

1) download and search through the /site_index.txt
   to see if the title has already been imaged.
2) email datawiz@apple2.com and arrange to have your
   disks mailed to have them imaged.
3) If you wish, your original disks can be returned. 

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***  Many thanks to the site mirrors and volunteers who have
***  given thier time and resources to help image, upload, 
***  identify, and sort the images on this site.