graphql-tools is a powerful set of utilities for building GraphQL schemas and resolvers in JavaScript. It provides developers with tools to create, manipulate, and extend GraphQL schemas easily, making it a popular choice for those looking to implement GraphQL in their applications. With features like schema stitching, merging, and type definitions, graphql-tools simplifies the process of building a robust GraphQL API. However, there are other libraries in the GraphQL ecosystem that also serve similar purposes. Here are a few alternatives:

• apollo-server is a community-driven, open-source GraphQL server that is designed to work seamlessly with Apollo Client. It provides a straightforward way to set up a GraphQL server with built-in support for features like subscriptions, file uploads, and more. apollo-server is ideal for developers looking for a comprehensive solution that integrates well with the Apollo ecosystem, making it easier to manage both client and server-side GraphQL implementations. Its extensive documentation and community support make it a go-to choice for many developers.
• express-graphql is a middleware for integrating GraphQL with Express, one of the most popular web frameworks for Node.js. It allows developers to create a GraphQL API quickly and easily by leveraging the existing Express infrastructure. express-graphql is a great choice if you are already using Express in your application and want to add GraphQL capabilities without introducing a new framework. It provides a simple way to define your schema and resolvers while benefiting from the flexibility and middleware capabilities of Express.

To see how graphql-tools compares with apollo-server and express-graphql, check out the comparison: Comparing graphql-tools vs apollo-server vs express-graphql.