Cutelyst is described as 'lets you create fast web applications using the cross-platform Qt framework so you can share the same code base as your desktop or mobile apps. It's a web framework that takes cues from the time-honored' and is an app in the Development category. There are three alternatives to Cutelyst for Linux, Mac and Windows. The best alternative is Oatpp, which is both free and Open Source. Other great apps like Cutelyst are Silicon web framework (Free, Open Source) and Crow framework (Free, Open Source).
Create fast web services with C++ using Oat++. It's a light, zero-dependency, no-installation web-framework. FEATURES - Asynchronous server (High performance. Handle 30K+ simultaneous connections) - Multithreaded server (Simple API)