Nexus Messenger

Nexus is a lightweight desktop hub for Windows that keeps the web apps you use all day in one window, pinned to a sidebar and one keyboard shortcut away.

What sets it apart is session isolation. A browser only holds one WhatsApp Web session at a time: opening a second account signs the first one out. Teams is no better: Microsoft's own answer is to use another browser or a private window. Nexus gives every service its own isolated session, so three WhatsApp numbers and two Teams organisations stay signed in at the same time and never sign each other out.

It also does the ordinary things well: native Windows notifications with per-service mute, unread badges in the sidebar, on the taskbar icon and in the tray, a catalogue of common services with their real logos plus any custom URL, drag-and-drop ordering, per-service sleep to give memory back, and close to tray.

Nexus tracks the stable Electron line, which is what decides whether the services it hosts keep working: web services drop support for old browser engines twice a year, and an aggregator that falls behind loses them one by one.

Free, open source under the MIT licence, English, French and Spanish.