Apps with 'Multi panel' feature

Opera is an innovative browser that focus on implementing new technologies without dropping simplicity and ease of use, speed, and security; supporting and contributing to open web standards.

nomacs is a free, open source image viewer, which supports multiple platforms. You can use it for viewing all common image formats including RAW and psd images.

SpaceFM is a multi-panel tabbed file and desktop manager for Linux with built-in VFS, udev- or HAL-based device manager, customisable menu system, and bash integration. SpaceFM aims to provide a stable, capable file manager with significant customisation capabilities.

A GPU-accelerated cross-platform terminal emulator and multiplexer written by @wez and implemented in Rust

The concept of the "Sushi Browser" is wanting to utilize the screen to the maximum capacity just by a simple operation.

Draw comics online with strangers and friends! PanelJam is the community where artists can have fun with comic strips one panel at a time in the collaborative online comic drawing game. Practice new subject matter, defeat artist's block, and connect with artists.

Highly customizable Wayland bar for Sway and Wlroots based compositors.

Fileside is a modern file manager for Mac and Windows that gives you complete layout control.