Full mirror:

ftp://208.185.231.250/pub/apple_II/
http://mirrors.apple2.org.za/ftp.apple.asimov.net/

partial mirror:

http://ftp.lahtermaher.org/pub/emulators/apple/
http://moscoso.org/pub/emulators/apple/
ftp://ftp.codepirate.org/pub/apple_II/