Titanium Backup - Titanium Backup is a very old backup app that has been around since the early days of Android. In fact, it's one of the few apps that covers all versions from 1. Read more about Titanium Backup.
iMyFone iTransor for WhatsApp - iMyfone iTransor for Whatsapp is the best transfer tool which can help you transfer Whatsapp cross-device.
CopyTrans Contacts - CopyTrans Contacts makes it easy to manage iPhone contacts, calendars, notes and messages from the...
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)
MyBackup - MyBackup Pro is the best Android backup as reviewed by PC World, ZD Net, CNet, and more. Easiest Android back up.
Syncios WhatsApp Transfer - Syncios WhatsApp Transfer is both phone to phone WhatsApp transfer and WhatsApp backup and restore tool. It not only supports to transfer WhatsApp chats iOS and Android devices, but also supports backing up your WhatsApp data to PC and restore .