final-form is a framework-agnostic form state management library that provides a simple and efficient way to manage form state in JavaScript applications. It is designed to be lightweight and flexible, allowing developers to create forms with minimal overhead. While final-form is a powerful option for managing form state, there are several alternatives in the React ecosystem that also offer form management solutions. Here are a few notable alternatives:

• formik is a popular library for building forms in React applications. It provides a set of tools and utilities to manage form state, validation, and submission. Formik simplifies the process of handling form inputs, making it easier to manage complex forms with validation requirements. If you are looking for a comprehensive solution that integrates well with React and offers built-in validation support, Formik is a great choice.
• react-final-form is a React-specific implementation of final-form. It leverages the same core principles of final-form while providing a set of React components and hooks that make it easy to integrate into React applications. React Final Form is ideal for developers who appreciate the flexibility of final-form but want a more React-centric API. It allows for efficient re-renders and provides a straightforward way to manage form state in React applications.
• redux-form is a library that integrates form state management with Redux, allowing developers to manage form state within the Redux store. This can be particularly useful for applications that already use Redux for state management. Redux Form provides a powerful way to manage forms, but it can introduce additional complexity due to its reliance on Redux. If your application is heavily based on Redux and you want to manage form state in a centralized manner, Redux Form may be the right choice.

To see how final-form compares with formik, react-final-form, and redux-form, check out the comparison: Comparing final-form vs formik vs react-final-form vs redux-form.