Atmosphere Deluxe: Nature Sounds Effects Generator 

Atmosphere is a sound generator that has many uses, primarily as a home sound environment generator and as a tool for creating custom nature CD's and ambient audio for professionals such as therapists, web developers.
nature sounds sounds of nature nature natural relaxing relaxation relax unwind nature seashore audio sounds birdsongs

Atmosphere Lite: Nature Sounds Generator 

Bring the sounds of nature to your desktop. Choose presets such as tropical, thundestorm, nighttime, summer and many others or alternatively customize your own soundscape from the background and random sounds provided
relaxing nature therapy relaxation relax unwind nature seashore audio sounds birdsongs desktop.