For Windows
North
American Bird Identification Guide
LANIUS Excalibur 2.0, The Ornithological Database for the Natural World!
AviSys 4.0 ~ Superior Birding Software
Lifer
Due North Software - Requires MS Windows
ZDNet
Download Page
North American Wild Birds
Due North Software - Requires MS Windows
ZDNet
Download Page
MacPeregrine
3.0
MacWatcher Software - Mac OS
