There is an app that you can use for that purpose and the app is free to download. The app name is iFunbox which you can use to browse within iOS device's stomach to find or search the apps inside it to be transferred or imported to computer.
Once you have download iFunBox for Mac or Windows, you can browse to the User Applications to shows all the installed applications listed in your device. Then select the apps you wish to transfer, after the apps are selected then right-click your mouse to choose Backup to .ipa package.
And you will be asked to choose place to save the ipa file, then choose the place you think is proper. Once you have placed the iPa app files then you can continue to transfer or install iPa files to iPhone, iPad, iPod touch without iTunes.
Oke that's how to transfer or import applications iPhone, iPod touch iPad to computer (Windows or Mac).