Apps with 'Tab Stacking' feature

Vivaldi is extremely customizable, presenting a wide range of settings and built-in features designed to put the user in control.

Wings for your Windows Explorer!.

Groupy is a powerful organizational tool for Windows that will keep information tabbed and organized. You can drag and drop multiple applications and documents together to group them into a tabbed interface for easy access and reference.

Inspire Leopard is a modern, fast, secure, intuitive and lighweight web browser for the 21st Century. Leopard brings you more privacy, safety and speed.

Multrin is a cross-platform app built on Electron that lets you to organize apps in tabs by simply dropping them onto Multrin. It aims to greatly improve your productivity and organization.