SeaStar is an event-driven framework allowing you to write non-blocking, asynchronous code in a relatively straightforward manner. It is based on futures. Seastar is the first framework to bring together a set of extreme architectural innovations, including Shared-nothing design, High-performance networking, Futures and promises, Message passing etc.

Seastar - High performance server-side application framework

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

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.
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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

mTCP is a high-performance user-level TCP stack for multicore systems. Scaling the performance of short TCP connections is fundamentally challenging due to inefficiencies in the kernel. mTCP addresses these inefficiencies from the ground up - from packet I/O and TCP connection management all the way to the application interface. It translates expensive system calls to shared memory access between two threads within the same CPU core.

mTCP - A Highly Scalable User-level TCP Stack for Multicore Systems

Aeron is an efficient reliable unicast and multicast transport protocol. The Aeron protocol is designed to be run directly over many different types of transmission media, including shared memory/IPC, InfiniBand/RDMA, UDP, TCP, Raw IP, HTTP, WebSocket, BLE, etc.

Aeron - Efficient reliable unicast and multicast transport protocol

Secure Socket Funneling (SSF) is a network tool and toolkit. It provides simple and efficient ways to forward data from multiple sockets (TCP or UDP) through a single secure TLS link to a remote computer. SSF also allows dynamic port forwarding with a SOCKS server from the client to the server  and from the server to the client.

Secure Socket Funneling - Network tool and toolkit

Rusty is a light-weight, user-space, event-driven and highly-scalable TCP/IP stack. It has been developed to run on a EZChip TILE-Gx36 processor. Rusty is a light-weight, user-space, event-driven and highly-scalable TCP/IP stack. It has been developed to run on a EZChip TILE-Gx36 processor. Rusty takes full control of cores it runs on. 

Rusty - Light-weight, user-space, event-driven and highly-scalable TCP/IP stack

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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