I did google it.Yes there is one desktop application you can find it on CNET(download.cnet.com/Google-Image-Downloader/3000-2381_4-75439931.html) it's name is Google Image Downloader it downloads original image and not the thumbnail...
And for bing this script will do it (github.com/ostrolucky/Bulk-Bing-Image-downloader)...
You didn't even Googled it bro... Google before asking...