Indy is an open source client/server communications library that supports TCP/UDP/RAW sockets, as well as over 100 higher level protocols including SMTP, POP3, IMAP, NNTP, HTTP, FTP, and many more. Indy is written in Delphi Pascal and is available for Delphi, C++Builder, FreePascal, Delphi.NET, and Kylix.

Internet Direct - The Indy Project

c-ares is a C library for asynchronous DNS requests.  It is an asynchronous resolver library. It is intended for applications which need to perform DNS queries without blocking, or need to perform multiple DNS queries in parallel. The primary examples of such applications are servers which communicate with multiple clients and programs with graphical user interfaces. c-ares is being used by libcurl, UnreadlIRCd, BZFlag, Xymon, libevnet, gLite, aria2, sipsak, Second Life, Wireshark, node.js and more.

c-ares - A C library for asynchronous DNS requests

Tokio is an asynchronous runtime for the Rust programming language. It provides the building blocks needed for writing network applications. It gives the flexibility to target a wide range of systems, from large servers with dozens of cores to small embedded devices. It provides a multi-threaded, work-stealing scheduler. Applications can process hundreds of thousands of requests per second with minimal overhead.
 
async/await reduces the complexity of writing asynchronous applications. Paired with Tokio's utilities and vibrant ecosystem, writing applications is a breeze.

Tokio is an asynchronous runtime for the Rust programming language. It provides the building blocks needed for writing network applications. It gives the flexibility to target a wide range of systems, from large servers with dozens of cores to small embedded devices. It provides a multi-threaded, work-stealing scheduler. Applications can process hundreds of thousands of requests per second with minimal overhead.

Tokio - Platform for writing fast networking code in Rust

A rust implementation of gRPC, a high performance, open source, general RPC framework that puts mobile and HTTP/2 first. tonic is a gRPC over HTTP/2 implementation focused on high performance, interoperability, and flexibility. This library was created to have first class support of async/await and to act as a core building block for production systems written in Rust.

A rust implementation of gRPC, a high performance, open source, general RPC framework that puts mobile and HTTP/2 first. Tonic is a gRPC over HTTP/2 implementation focused on high performance, interoperability, and flexibility. This library was created to have first class support of async/await and to act as a core building block for production systems written in Rust.

Tonic - A native gRPC client & server implementation with async/await support.

TML Messaging Suite is a network messaging library for rapid development of extensible and scalable interfaces. Based on the peer to peer standard protocol BEEP (Blocks Extensible Exchange Protocol), defined in RFC3080 and RFC3081 libTML is suitable for many use cases and communication patterns. The libtml-c project is a C++ implementation of a library with a C interface on top of the Vortex beepcore.

LibTML Messaging Suite - Network Messaging Library in C++

ASP.NET SignalR is a library for ASP.NET developers that makes it incredibly simple to add real-time web functionality to your applications. It's the ability to have your server-side code push content to the connected clients as it happens, in real-time. SignalR also provides a very simple, high-level API for doing server to client RPC (call JavaScript functions in your clients' browsers from server-side .NET code) in your ASP.NET application.

SignalR - Incredibly simple real-time web for .NET

Libmill is a library that introduces Go-style concurrency to C. It can execute up to 20 million coroutines and 50 million context switches per second. It also contains simple networking and file access library that allows users to quickly bootstrap application development.

libmill - Go-style concurrency in C

Mio is a lightweight I/O library for Rust with a focus on adding as little overhead as possible over the OS abstractions. This is a low level library, if you are looking for something easier to get started with Tokio. Its feature include Non-blocking TCP and UDP, I/O event queue backed by epoll, kqueue, and IOCP.

Mio - Metal IO library for Rust

Cilium is open source software for providing and transparently securing network connectivity and loadbalancing between application workloads such as application containers or processes. Cilium operates at Layer 3/4 to provide traditional networking and security services as well as Layer 7 to protect and secure use of modern application protocols such as HTTP, gRPC and Kafka. Cilium is integrated into common orchestration frameworks such as Kubernetes.
 
A new Linux kernel technology called eBPF is at the foundation of Cilium. It supports dynamic insertion of eBPF bytecode into the Linux kernel at various integration points such as: network IO, application sockets, and tracepoints to implement security, networking and visibility logic. eBPF is highly efficient and flexible.

Cilium is open source software for providing and transparently securing network connectivity and loadbalancing between application workloads such as application containers or processes. Cilium operates at Layer 3/4 to provide traditional networking and security services as well as Layer 7 to protect and secure use of modern application protocols such as HTTP, gRPC and Kafka. Cilium is integrated into common orchestration frameworks such as Kubernetes.

Cilium -  eBPF-based Networking, Security, and Observability

Node.js is a server-side JavaScript environment that uses an asynchronous event-driven model. It could handle thousands of concurrent connections. This allows Node.js to get excellent performance based on the architectures of many Internet applications. It is an evented I/O for <A HREF="http://code.google.com/p/v8/" target="_blank">V8</A>, which is Google's open source JavaScript engine. Using Javascript in the server and in the browser helps to work in a single programming environment. They could communicate using JSON.

Node.js is a server-side JavaScript environment that uses an asynchronous event-driven model. It could handle  thousands of concurrent connections. This allows Node.js to get excellent performance based on the architectures of many Internet applications. It is an evented I/O for V8, which is Google's open source JavaScript engine.

Node.JS - Builds Scalable Network Programs

libuv is a multi-platform support library with a focus on asynchronous I/O. It was primarily developed for use by Node.js, but it’s also used by Luvit, Julia, pyuv, and others. Its feature includes event loop backed by epoll, kqueue, IOCP, event ports.
Asynchronous TCP and UDP sockets, 
Asynchronous DNS resolution, Thread pool, Signal handling and lot more.

libuv - Cross platform Asynchronous I/O

DotNetty is a port of Netty, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

DotNetty - a port of netty, event-driven asynchronous network application framework

Alamofire is an HTTP networking library written in Swift. It supports Chainable Request / Response Methods,  Upload File / Data / Stream / MultipartFormData,  Download File using Request or Resume Data,  TLS Certificate and Public Key Pinning,  Network Reachability,  HTTP Response Validation,  URL / JSON Parameter Encoding and lot more.

Alamofire - Elegant HTTP Networking in Swift

Testing distributed systems under hard failures like network partitions and instance termination is critical, but it's also important we test them under less catastrophic conditions because this is what they most often experience. Comcast is a tool designed to simulate common network problems like latency, bandwidth restrictions, and dropped/reordered/corrupted packets.



Comcast - Simulating shitty network connections so you can build better systems.

QuickServer is an open source Java library/framework for quick creation of robust and multi-threaded, multi-client TCP server applications. With QuickServer one can just concentrate on just the application logic/protocol on hand. QuickServer provides an abstraction over the ServerSocket, Socket and other network and input output classes and it eases the creation of powerful network servers.

QuickServer - TCP server framework

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