Vaadin Framework is described as 'Vaadin is a web application framework for Rich Internet Applications (RIA). In contrast to Javascript libraries and browser-plugin based solutions, it features a robust server-side architecture. This means that the largest part of the application logic runs securely on the' and is a Web Framework in the development category. There are more than 10 alternatives to Vaadin Framework for a variety of platforms, including Windows, Linux, Mac, Self-Hosted and Web-based apps. The best Vaadin Framework alternative is Ktor, which is both free and Open Source. Other great apps like Vaadin Framework are Jmix, Spring, Play! and GWT (Google Web Toolkit).
Its secure even though it still doesn't have a lot of supports