Life & fun · alternatives · 2026

24 alternatives to A fast, asynchronous, and easy-to-use TCP server library for the JVM

A fast, asynchronous, and easy-to-use TCP server library for the JVM (built on libuv). - carlie/README.md at develop · 1791-labs/carlie

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. A fast, asynchronous, and easy-to-use TCP server library for the JVM launched in 2019; newer entries below may have overtaken it.

1. 1LT
   Lightweight Threads, Channels and Actors for the JVM▲116

   2013 · blog.paralleluniverse.co · its alternatives →

2. 2DA
   DriftDB – an open source WebSocket backend for real-time apps▲367

   Hey HN! I’ve written a bunch of WebSocket servers over the years to do simple things like state synchronization, WebRTC signaling, and notifying a client when a backend job was run. I realized that if I had a simple way to create a private, temporary, mini-redis that the client could talk to directly, it would save a lot of time. So we created DriftDB. In addition to the open source server that you can run yourself, we also provide https://jamsocket.live where you can use an instance we host on Cloudflare’s edge (~13ms round trip latency from my home in NY). You may have seen my…

   2023 · driftdb.com · its alternatives →

3. 3
   I finished v5 of a JVM framework I've spent spent half a decade making▲377

   ForewordJavalin is a Java and Kotlin web framework which focuses on simplicity and Java/Kotlin interoperability.It supports WebSockets and HTTP3, and it uses...

   2022 · javalin.io · its alternatives →

4. 4
   Deepstream.io – open-source real-time server with pub/sub and data sync▲301

   A realtime server for the modern web

   2016 · deepstream.io · its alternatives →

5. 5
   Pure C Asynchronous HTTP Framework▲80

   Asynchronous C networking library with HTTP server, WebSockets, reverse proxy, HTTP/2 gRPC client, TLS and event loop. - Softmotions/iwnet

   2022 · github.com · its alternatives →

6. 6
   Asynchronous HTTP/2 client for Python 2.7▲94

   Tornado HTTP/2 Client. Contribute to vladmunteanu/th2c development by creating an account on GitHub.

   2018 · github.com · its alternatives →

7. 7
   A UDP to TCP proxy server for sending HTTP requests with zero latency▲146

   A UDP to TCP proxy server for sending HTTP requests with zero roundtrips - TimeToogo/ff-proxy

   2020 · github.com · its alternatives →

8. 8IB
   IPC between multiple Java processes/JVMs with nanosecond latency▲114

   2015 · mappedbus.io · its alternatives →

9. 9
   Whirlwind – Async concurrent hashmap for Rust▲140

   Hey HN, this is Will and David from Fortress (https://news.ycombinator.com/item?id=41426998). We use a lot of async Rust internally, and created this library out of a need for an async-aware concurrent hashmap since there weren’t many available in the Rust ecosystem. Whirlwind is a sharded HashMap with a fully asynchronous API. Just as dashmap is a replacement for std::sync::RwLock, whirlwind aims to be a replacement for tokio::sync::RwLock. It has a similar design and performance characteristics to dashmap, but seems to perform better in read-heavy workloads with tokio's…

   2024 · github.com · its alternatives →

10. 10
    Faasta – A self-hosted Serverless platform for WASM-wasi-HTTP in Rust▲95

    I've just released an early version off my project I've been working on for a few months now and would love some feedback. https://github.com/fourlexboehm/faasta I was surprised there isn't yet an open/source and standards compliant way to host wasi-http functions in a way that takes advantages of WASM, a multi tenanted application. If you're not familiar with wasi, Compared to something like AWS Lambda, this approach is much more efficient as a single process can serve 1000s of function invocations concurrently and asynchronously, instead requiring an entire VM.…

    2025 · github.com · its alternatives →

11. 11
    Second State VM▲78

    High performance secure & portable Rust functions in Node.js

    2020 · secondstate.io · its alternatives →

12. 12
    A minimal Fortran TCP client and server▲110

    A minimal Fortran TCP client and server. Contribute to modern-fortran/tcp-client-server development by creating an account on GitHub.

    2019 · github.com · its alternatives →

13. 13
    Fast 2kB date library alternative to Moment.js with the same API▲122

    ⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API - iamkun/dayjs

    2018 · github.com · its alternatives →

14. 14
    Kyushu – A self-hostable WASM sandbox for JavaScript workers▲89

    A self-hostable Wasm sandbox for JavaScript workers.

    Jun 2026 · kyushu.dev · its alternatives →

15. 15
    Condor – A library for building scalable TCP servers in Erlang▲65

    A minimal library for building scalable TCP servers in Erlang - sinasamavati/condor

    2018 · github.com · its alternatives →

16. 16
    GraphQL lib for real-time apps▲68

    A flexible GraphQL client and server library that can be used to power realtime applications. - tjmehta/primus-graphql

    2018 · github.com · its alternatives →

17. 17
    Nsynjs – JS engine with stoppable threads and without callback hell▲51

    JavaScript engine + state machine with threads and without callbacks - amaksr/nsynjs

    2017 · github.com · its alternatives →

18. 18
    Msngr.js, a messaging library for JavaScript▲32

    An asynchronous messaging library, written in JavaScript, for node and the web browser - KrisSiegel/msngr.js

    2015 · github.com · its alternatives →

19. 19
    TCP chat server written in C# and .NET 9, used in the terminal▲23

    A simple chat server written in C#. Contribute to Sieep-Coding/simple-chat-csharp development by creating an account on GitHub.

    Jan 2026 · github.com · its alternatives →

20. 20
    Pings 8000 servers in 11 seconds: Parallel HTTP/SSH/TCP/Ping library▲22

    Fast Parallel Async HTTP/SSH/TCP/UDP/Ping Client Java Library. Aggregate 100,000 APIs & send anywhere in 20 lines of code. Ping/HTTP Calls 8000 servers in 12 seconds. (Akka) www.parallec.io - eBay/parallec

    2015 · github.com · its alternatives →

21. 21
    Hellepoll is a blazingly-fast async HTTP server written in C++▲35

    This is based on an approach I made for a very high performance message and video multiplexing server. The project died, but I'm glad I get to share the a basic version with some http test code now. I admit this is the second time I've tried to show this off here today; I posted earlier but it got lost when no-one was watching :(

    2011 · github.com · its alternatives →

22. 22SS
    SSVM – Speed up your Node.js apps with Rust and WebAssembly▲5

    Raw performance (the lack of) is always a contentious point for JavaScript, especially in our post-Moore era of computing. Node.js gets around this issue through extensive of use of native libraries and modules written in C, including the V8 JS engine itself. But as application developers, how do YOU create high performance functions? Write in C and run as a NAPI module? Write in Rust and run as a V8 wasm? Well, there is another (better and faster) way now! The SSVM is a fully featured WebAssembly VM that is optimized for server-side applications.…

    2020 · its alternatives →

23. 23WW
    Working With TCP Sockets book▲32

    2012 · workingwithtcpsockets.com · its alternatives →

24. 24JR
    Java Returns to the Browser with TeaVM▲12

    2019 · blogs.oracle.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →