I would say theis by far the most popular speech synthesis application for Linux. And, seems to be the most popular speech recognition system for Linux. Most modern bundled AI systems for desktop users are built for the Windows platform.
There are different ways to categorize agent products, including by operating system or hardware platform, such as PC or mobile. General categories of agent products include: Web API, Mobile App, and Desktop Software. Standalone desktop software is the oldest of the three categories, and traditionally not networked or cloud-based, like web APIs and mobile apps are today.
Windows desktop agents include: