Altus is described as 'Cross-platform desktop WhatsApp client with themes, multiple account support and much more!' and is an app. There are four alternatives to Altus for Linux, Flathub, Snapcraft, Mac and Windows. The best Altus alternative is Whatsie, which is both free and Open Source. Other great apps like Altus are ZapZap, WhatsApp Desktop and Whakarere.
Whatsie is a native Linux desktop wrapper for WhatsApp Web, built on Qt and QtWebEngine. It brings WhatsApp out of the browser tab and into a proper desktop application with system integration, privacy controls, and customization options unavailable in a plain browser.
Unofficial whatsapp web desktop client for OSX, Linux and Windows. Build with Electron.
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