iOS Deploy: https://github.com/ios-control/ios-deploy

iOS App Signer: https://dantheman827.github.io/ios-app-signer/

NOTE: as of late 2019, Cydia Impactor can only install IPA files to an iPhone if you have a (paid) developer account; if you are attempting to use Impactor to install an IPA file and you have not paid your Apple tax, it will not function.

Source: http://www.cydiaimpactor.com/