You can transfer IPA apps from pc to iOS devices with simple free apps and software. As prerequisite the device must be jailbroken.
These methods allow you to don’t use iTunes.
Method 1 – iTools
This free software for Windows and Mac allows to easily transfer and install .ipa files (read the instructions).
Method 2 – iFunbox
This free software for Windows and Mac allows to easily transfer and install .ipa files, go to homepage.