Rambox is a workspace organizer that allows users to unify as many applications as desired, presented as ideal for those who care about productivity while working with many business and personal apps.

It features

Customizable workspaces - Organize as desired
Extensions - Integrate 3rd party add-ons like a grammar checker, password managers, etc.
Focus mode - Pause notifications and sounds to stay focused.
Themes - Select a theme to fit the mood and style.
Notifications management - Unifies alerts in a Notification Center.
Quick search - jump between applications.
Real-time synchronization - Save workspace configurations and synchronize between computers in real-time.
Spell checker - Configure each app to highlight errors automatically in different spelling languagues.
Hibernation - Automatically suspend inactive tabs to save your device's memory and CPU and extend its battery life.
Session management - Use private or shared sessions to simplify and tailor your experience.
Proxies - Use different proxies on each app or a general proxy.
Lock app - Protect a session with a Master password or with a FIDO U2F security key.
JavaScript & CSS injection - Improve each app experience by including JavaScript code and styling independently.
Apps manager - Check the computer resources each app consumes.

Rambox is available via a free plan with limited features, and its more advanced features can be tried free for 30 days. It is available for a monthly payment, with a discount for annual pricing. Alternately, a Pro plan is available for a single licensing fee. It is a downloadable solution, compatibile with Windows, Mac, and Linux operating systems.