Gunicorn 'Green Unicorn' is a Python WSGI HTTP Server for UNIX. It's a pre-fork worker model ported from Ruby's Unicorn project. The Gunicorn server is broadly compatible with various web frameworks, simply implemented, light on server resources, and fairly speedy.

Gunicorn - Python WSGI HTTP Server for UNIX

Tide is a friendly HTTP server built for casual Rustaceans and veterans alike. It's completely modular, and built directly for async/await. Whether it's a quick webhook, or an L7 load balancer, Tide will make it work. Each Tide endpoint takes a Request and returns a Response. Because async functions allow us to wait without blocking, this makes Tide feel similar to synchronous servers. Except it's incredibly efficient.

Serve the web – HTTP server framework

Wakanda. One open and complete solution for all your Web and mobile business apps. Its purpose is One language. One complete stack and All JavaScript. It has 3 components Wakanda Studio, Wakanda Server, Wakanda Application Framework. 
 
Wakanda Server is a super-rapid datastore and HTTP server, it's a home for all your app's business logic. Wakanda Application Framework (WAF) is the JavaScript framework served by Wakanda Server to implement the magic behind Wakanda HTML widgets. WAF also provides server side modules or services. Wakanda Studio is a visual designer for your datastore and front end, as well as code editor.

Wakanda. One open and complete solution for all your Web and mobile business apps. Its purpose is One language. One complete stack and All JavaScript. It has 3 components Wakanda Studio, Wakanda Server, Wakanda Application Framework. 

Wakanda - JavaScript Development platform for Web & mobile applications

NanoHttpd is a light-weight HTTP server designed for embedding in other applications.It supports HTTPS (SSL), Cookies, Built-in support for HEAD, POST and DELETE requests. You can easily implement/customize any HTTP method, though, File upload, HTTP 1.1 support and lot more.

NanoHTTPD – A Tiny web server in Java

Polka is an extremely minimal, highly performant Express.js alternative. Polka is just a native HTTP server with added support for routing, middleware, and sub-applications. That's it! It is 33-50% faster than Express for simple applications. 

Polka - A micro web server so fast, it'll make you dance!

http4k is an HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way. It consists of a core library http4k-core providing a base HTTP implementation + a number of abstractions for various functionalities (such as servers, clients, templating etc) that are provided as optional add-on libraries.
 
http4k apps can be simply mounted into a running Server, Serverless platform, or compiled to GraalVM and run as a super-lightweight binary. In a single line of code you can switch your server between Java (built-in), Apache, Jetty, Netty, Undertow, Ktor, or Ratpack. In a single line of code you can also switch your client implementation between Java (built-in), Apache, Jetty, and OkHttp.

http4k is an HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way. It consists of a core library http4k-core providing a base HTTP implementation + a number of abstractions for various functionalities (such as servers, clients, templating etc) that are provided as optional add-on libraries.

http4k - HTTP toolkit written in Kotlin that enables the serving and consuming of HTTP services in a functional and consistent way

A super-easy, composable, web server framework for warp speeds. The fundamental building block of warp is the Filter: they can be combined and composed to express rich requirements on requests. It has support for Multipart form data, Websockets, Gzip, Deflate, and Brotli compression, Access logging, Static Files and Directories and lot more.

warp - A super-easy, composable, web server framework for warp speeds

tinyhttp is a modern Express-like web framework written in TypeScript and compiled to native ESM, that uses a bare minimum amount of dependencies trying to avoid legacy hell. It has Async middleware support and it is 2x faster than Express. 

tinyhttp - Mordern Express like Web Framework

OpenLiteSpeed is a high-performance, lightweight, open source HTTP server developed and copyrighted by LiteSpeed Technologies. It is event driven and it can handle hundreds of thousands of concurrent connections without load spikes.
 
Its feature include: 
<UL>
<LI>WebAdmin GUI with real-time statistics.</LI>
<LI>Rewrite engine uses Apache mod_rewrite syntax.</LI>
<LI>High-performance page caching.</LI>
<LI>Gzip compression for reduced bandwidth use.</LI>
<LI>HTTPS up to 4x faster than Apache.</LI>
<LI>Supports PHP, Ruby, Python, Perl, and Java external applications.</LI>
<LI>Buffers requests and responses to external applications to more efficiently serve multiple connections.</LI>
<LI>Apache-compatible SSI support.</LI>
<LI>Bandwidth and connection throttling.</LI>
<LI>Chunked transfer encoding.</LI>
<LI>IPv4 and IPv6 support.</LI>
<LI>Load balancing.</LI>
<LI>WebSocket proxy support. </LI>
<LI>mp4 and flv streaming. </LI>
<LI>Easy virtual host configuration via templates.</LI>
<LI>Can serve as a reverse proxy to accelerate static content delivery, compress throughput, or run security.</LI>
</UL>

OpenLiteSpeed is a high-performance, lightweight, open source HTTP server developed and copyrighted by LiteSpeed Technologies. It is event driven and it can handle hundreds of thousands of concurrent connections without load spikes.


OpenLiteSpeed -  High performance, lightweight, HTTP server

The project aims to build upon the latest C++ standard (currently C++11) to provide easy to use libraries for network programming. We use the latest compiler versions and features with an eye on pushing the boundaries on leveraging what's available in C++. Currently the library contains an HTTP client and server implementation, a stand-alone URI library, a network message framework, and some concurrency tools.

cpp-netlib - The C++ Network Library Project

Http4s is a minimal, idiomatic Scala interface for HTTP services. Http4s is Scala's answer to Ruby's Rack, Python's WSGI, Haskell's WAI, and Java's Servlets.

http4s -  A typeful, purely functional, streaming library for HTTP clients and servers in Scala

Libevhtp was created as a replacement API for Libevent's current HTTP API. The reality of libevent's http interface is that it was created as a JIT server, meaning the developer never thought of it being used for creating a full-fledged HTTP service. 

libevhtp - Create extremely-fast and secure embedded HTTP servers with ease

Phorklift is an HTTP server and proxy daemon, with clear, powerful and dynamic configuration. It is similar to Nginx, provides high performance and low memory usage. It supports HTTP/1.x and HTTP/2, Static file service, proxy, ACL, gzip, etc. Lua is used configuration, which makes simple and powerful.



Phorklift - HTTP server and proxy daemon, with clear, powerful and dynamic configuration.

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