httpuv: HTTP and WebSocket Server Library

BIND 9: DNS software system including an authoritative server, a recursive resolver and related utilities.
cjdns: Encrypted self-configuring network/VPN routing engine
clearskies_core: Clearskies file synchronization program. (C++11)
CMake open-source, cross-platform family of tools designed to build, test and package software
Coherence: Cryptographic server for modern web apps.
DPS-For-IoT: Fully distributed publish/subscribe protocol.
HashLink: Haxe run-time with libuv support included.
Haywire: Asynchronous HTTP server.
H2O: An optimized HTTP server with support for HTTP/1.x and HTTP/2.
Igropyr: a async Scheme http server base on libuv.
Julia: Scientific computing programming language
Kestrel: web server (C# + libuv + ASP.NET Core)
Knot DNS Resolver: A minimalistic DNS caching resolver
Lever: runtime, libuv at the 0.9.0 release
libnode: C++ implementation of Node.js
libstorj: Library for interacting with Storj network
libuv_message_framing Message-based communication for libuv
luaw: Lua web server backed by libuv
Luvit: Node.JS for the Lua Inventor
mo: Scheme (guile) + libuv runtime
MoarVM: a VM for Rakudo Raku
Mysocks: a cross-platform Shadowsocks client
mediasoup: Powerful WebRTC SFU for Node.js
Neovim: A major refactor of Vim.
node9: A portable, hybrid, distributed OS based on Inferno, LuaJIT and Libuv
node.js: Javascript (using Google's V8) + libuv
node.native: node.js-like API for C++11
nodeuv: An organization with several c++ wrappers for libs which are used in node.js.
phastlight: Command line tool and web server written in PHP 5.3+ inspired by Node.js
pilight: home automation ("domotica")
pixie: clojure-inspired lisp with a tracing JIT
potion/p2: runtime
racer: Ruby web server written as an C extension
spider-gazelle: Ruby web server using libuv bindings
Suave: A simple web development F# library providing a lightweight web server and a set of combinators to manipulate route flow and task composition
Swish: Concurrency engine with Erlang-like concepts. Includes a web server.
Trevi: A powerful Swift Web Application Server Framework Project
Urbit: runtime
uv_callback libuv thread communication
uvloop: Ultra fast implementation of python's asyncio event loop on top of libuv
Wren CLI: For io, process, scheduler and timer modules

libtuv: libuv fork for IoT and embedded systems

Ring
RingLibuv
Ruby
libuv
uvrb
ruv
rbuv
mruby-uv: mruby binding
Lua
luv
lev
lluv
C++11
uvpp - Not complete, exposes very few aspects of libuv
C++17
uvw - Header-only, event based, tiny and easy to use libuv wrapper in modern C++.
Python
Pyuv
uvloop - Ultra fast asyncio event loop.
gevent - Coroutine-based concurrency library for Python
C#
NetUV
LibuvSharp
Perl 5
UV
Raku
MoarVM uses libuv
PHP
php-uv
Go
go-uv
OCaml
luv
uwt
ooc
ooc-uv
dylan
uv-dylan
R
httpuv: HTTP and WebSocket server library for R
fs: Cross-platform file system operations
Java
libuv-java: Java bindings
Nim
nimuv: Nim bindings
Lisp
cl-libuv Common Lisp bindings
cl-async Common Lisp async abstraction on top of cl-libuv
Céu
Céu-libuv
Delphi
node.pas NodeJS-like ecosystem
Haskell
Z.Haskell