C++ is a powerful and versatile programming language that is commonly used for developing web applications. A web framework is a software framework designed to aid the development of web applications, web services, and web resources. In this article, we will discuss the top 10 free and open-source C++ web frameworks that can help you build robust and scalable web applications.

1. Wt (Web Toolkit):
Wt is a C++ library for developing web applications. It allows developers to seamlessly integrate C++ code with HTML, CSS, and JavaScript. Wt provides a set of easy-to-use APIs for creating dynamic and interactive web applications. It also offers built-in support for various web technologies such as web sockets, AJAX, and RESTful web services.

2. Cutelyst:
Cutelyst is a C++ web framework based on the Qt library. It provides a simple and elegant API for creating web applications in C++. Cutelyst supports various web technologies such as templating, routing, and session management. It is lightweight and offers excellent performance for developing high-traffic web applications.

3. Crow:
Crow is a microframework for C++ that is designed for building lightweight and fast web applications. It offers a simple API for routing, middleware handling, and request handling. Crow is ideal for building RESTful web services and APIs. It is easy to set up and has a minimalistic design that makes it suitable for small projects.

4. Pistache:
Pistache is a modern C++ web framework that is built on top of the Boost library. It provides a robust and scalable foundation for developing web applications in C++. Pistache supports various web protocols such as HTTP and WebSocket. It offers a clean and intuitive API for routing, request handling, and response generation.

5. CppCMS:
CppCMS is a high-performance web application framework for C++. It is designed to handle high-traffic and dynamic web applications efficiently. CppCMS supports various web technologies such as caching, internationalization, and security features. It offers a flexible and modular architecture that allows developers to customize and extend the framework as needed.

6. Tntnet:
Tntnet is a template-based C++ web application framework that is designed for building dynamic web applications. It offers a rich set of features for creating interactive and data-driven web applications. Tntnet provides support for various web technologies such as XML, JSON, and SQL. It is easy to use and provides excellent performance for developing web applications.

7. CppCMS:
CppCMS is a highly scalable and extensible web framework for C++. It is designed to handle high-traffic web applications efficiently. CppCMS provides a secure and robust foundation for developing web applications. It offers a flexible and modular architecture that allows developers to customize and extend the framework as needed.

8. Silicon:
Silicon is a lightweight and efficient C++ web framework that is designed for building RESTful web services. It offers a simple and intuitive API for handling HTTP requests and responses. Silicon supports various web technologies such as JSON serialization, routing, and error handling. It is easy to set up and has a minimalistic design that makes it suitable for small projects.

9. Poco:
Poco is a powerful and versatile C++ library that provides a rich set of features for developing web applications. It offers support for various web technologies such as HTTP, HTTPS, and web sockets. Poco provides a modular architecture that allows developers to build custom web applications with ease. It is easy to use and offers excellent performance for developing high-traffic web applications.

10. UppWt:
UppWt is a C++ web framework that is based on the Ultimate++ library. It provides a comprehensive set of features for building web applications in C++. UppWt offers support for various web technologies such as templating, session management, and database integration. It is easy to set up and has a user-friendly API that makes it ideal for building web applications.

In conclusion, these 10 free and open-source C++ web frameworks offer a wide range of features and capabilities for developing web applications. Whether you are building a small project or a high-traffic web application, these frameworks provide a solid foundation for creating dynamic and interactive web applications in C++. Choose the framework that best fits your requirements and start building your web applications today.