Little Snitch - Little Snitch is a firewall application that monitors and controls outbound internet traffic.

iMyFone iTransor for WhatsApp - iMyfone iTransor for Whatsapp is the best transfer tool which can help you transfer Whatsapp cross-device.

NetGuard - NetGuard

iMazing - iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)

Portmaster - Is a Privacy Modular Privacy App which includes a "DNS over TLS" feature as well as an "Application Firewall".

CopyTrans - CopyTrans is a tool for managing the files on your iPhone or iPad through your computer's interface.