2.6
Apollo is a community-maintained open-source GraphQL server. It works with pretty much all Node.js HTTP server frameworks. Apollo Server works with any GraphQL schema built with GraphQL.js, so you can build your schema with that directly or with a convenience library such as graphql-tools.
GraphQL Portal is an open-source tool, existing in the SAAS version too, that lets developers connect any data-source (REST/SOAP/gRPC API, databases, files, or other GraphQL APIs) using many available data-connectors.