Sangria is a scala GraphQL library. I would also recommend you to check out http://try.sangria-graphql.org. It is an example of GraphQL server written with Play framework and Sangria. It also serves as a playground, where you can interactively execute GraphQL queries and play with some examples.

Sangria - Scala GraphQL implementation

Zeal is an offline documentation browser for software developers. 

Zeal - Offline documentation browser inspired by Dash

chi is a lightweight, idiomatic and composable router for building Go 1.7+ HTTP services. It's especially good at helping you write large REST API services that are kept maintainable as your project grows and changes. chi is built on the new context package introduced in Go 1.7 to handle signaling, cancelation and request-scoped values across a handler chain. 
The focus of the project has been to seek out an elegant and comfortable design for writing REST API servers, written during the development of the Pressly API service that powers our public API service, which in turn powers all of our client-side applications.

chi is a lightweight, idiomatic and composable router for building Go 1.7+ HTTP services. It's especially good at helping you write large REST API services that are kept maintainable as your project grows and changes. chi is built on the new context package introduced in Go 1.7 to handle signaling, cancelation and request-scoped values across a handler chain.

chi - Lightweight, idiomatic and composable router for building Go HTTP services

Slate helps you create beautiful, intelligent, responsive API documentation.  Slate is responsive, so it looks great on tablets, phones, and even in print. The description of your API is on the left side of your documentation, and all the code examples are on the right side. It supports Syntax highlighting, Markdown, RTL support and lot more.

SLATE - Beautiful static documentation for your API

Ponzu is a powerful and efficient open-source HTTP server framework and CMS. It provides automatic, free, and secure HTTP/2 over TLS, a useful CMS and scaffolding to generate content editors, and a fast HTTP API on which to build modern applications. 
 
With the rise in popularity of web/mobile apps connected to JSON HTTP APIs, better tools to support the development of content servers and management systems are necessary. Ponzu fills the void where you want to reach for Wordpress to get a great CMS, or Rails for rapid development, but need a fast JSON response in a high-concurrency environment.

Ponzu is a powerful and efficient open-source HTTP server framework and CMS. It provides automatic, free, and secure HTTP/2 over TLS, a useful CMS and scaffolding to generate content editors, and a fast HTTP API on which to build modern applications.

Ponzu - Headless CMS with automatic JSON API

Express is a minimal and flexible Node.js web application framework that provides a robust set of features for web and mobile applications. It provides a thin layer of fundamental web application features, without obscuring Node.js features that you know and love.

Express - Fast, unopinionated, minimalist web framework for Node

JSDoc 3 is an API documentation generator for JavaScript, similar to Javadoc or phpDocumentor. You add documentation comments directly to your source code, right alongside the code itself. The JSDoc tool will scan your source code and generate an HTML documentation website for you.

JSDoc - An API documentation generator for JavaScript

The most advanced open-source Content Management Framework to build powerful API with no effort. It is elegant, entirely customizable and fully extensible admin panel, Built on top of Node.js and supports any front-end frameworks (React, Vue, Angular, etc.), mobile apps or even IoT. Halfway between a CMS and a framework, Strapi takes advantages of both worlds. A powerful dashboard to easily manage your content with a flexible framework layer to develop and integrate specific features.

Strapi - Node.js Content Management Framework (headless-CMS) to build powerful API with no effort.

Hoppscotch is an open source API development ecosystem. It is light weight and can send fast requests and get/copy responses in real-time. It supports WebSocket, Server Sent Events, Socket.IO, MQTT and GraphQL. You can also install as a PWA (Progressive Web App) on your device.

Hoppscotch - Open source API development ecosystem 

HTTPie (pronounced aitch-tee-tee-pie) is a command line HTTP client. Its goal is to make CLI interaction with web services as human-friendly as possible. It provides a simple http command that allows for sending arbitrary HTTP requests using a simple and natural syntax, and displays colorized output. HTTPie can be used for testing, debugging, and generally interacting with HTTP servers.

HTTPie - a CLI, cURL-like tool for humans

Generates a RESTful web API Documentation.apiDoc creates a documentation from API descriptions in your source code. It has support of API history, with that various API version levels can be compared.So it can be retraced what changed in the API since the last version.

apidoc - RESTful web API Documentation Generator.

CCXT – CryptoCurrency eXchange Trading Library. A JavaScript / Python / PHP library for cryptocurrency trading and e-commerce with support for many bitcoin/ether/altcoin exchange markets and merchant APIs. The CCXT library is used to connect and trade with cryptocurrency / altcoin exchanges and payment processing services worldwide. It provides quick access to market data for storage, analysis, visualization, indicator development, algorithmic trading, strategy backtesting, bot programming, webshop integration and related software engineering.

CCXT - A JavaScript / Python / PHP cryptocurrency trading library with support for more than 100 bitcoin/altcoin exchanges

Absinthe is a GraphQL implementation for Elixir. An idiomatic, readable, and comfortable API for Elixir developers. It has complete implementation of the GraphQL Working Draft. It is easily pluggable, the entire query processing pipeline is configurable. Add, swap out, or remove the parser, individual validations, or resolution logic at will, even on a per-document basis.

Absinthe - The GraphQL toolkit for Elixir

Lad is the best Node.js framework. Made by a former Express TC and Koa team member. Lad boasts dozens of features and is extremely configurable. Lad framework includes Webapp server, API server, Proxy server, Job scheduler, Font end, Back end, Email Engine, Translation, Error Handling, Security, Performance.

Lad - Best Node.js framework. Made by a former Express TC and Koa team member

Yao is a low-code engine that creates a database model, writes API services, and describes dashboard interface just by JSON for web & hardware, no code, and 10x productivity. 
 
Yao has a built-in data management system. By writing JSON to describe the interface layout, 90% of the common interface interaction functions can be realized. It is especially suitable for quickly making various management background, CRM, ERP and other internal enterprise systems. Special interactive functions can also be implemented by writing extension components or HTML pages.

Yao is a low-code engine that creates a database model, writes API services, and describes dashboard interface just by JSON for web & hardware, no code, and 10x productivity. 

Yao - A low code engine to create web services and dashboard

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