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Top 23 C Networking Projects
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libcurl
A command line tool and library for transferring data with URL syntax, supporting DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, MQTTS, POP3, POP3S, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS and WSS. libcurl offers a myriad of powerful features
Project mention: Two ARM64-specific compiler optimization bugs, in GCC 15/16 and Rust, hit curl | news.ycombinator.com | 2026-10-06The social post links to this bug https://github.com/curl/curl/issues/23237
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Project mention: Zero-Copy Buffer Manipulation: Parsing Market Data at Memory Speed | dev.to | 2026-03-20
When a TCP packet lands, your OS writes it into a kernel buffer. libuv (makes Node not single lane), copies that packet from the kernel buffer to a Node buffer. The data event fires for one. So far, so good. Most code then does something like this:
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Project mention: I/O Multiplexing (select vs. poll vs. epoll/kqueue) | news.ycombinator.com | 2025-10-12
or better yet, go with libevent (https://libevent.org, almost) always better than ’naked’ calls to low level routines, and cross-platform to boot.
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cjdns
An encrypted IPv6 network using public-key cryptography for address allocation and a distributed hash table for routing.
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Project mention: FRRouting – implements and manages various IPv4 and IPv6 routing protocols | news.ycombinator.com | 2026-06-01
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Project mention: Training LLMs on Mixed GPUs: My Experiments and What I Learnt | dev.to | 2025-11-28
UCX developers also said here that CUDA and ROCm support is “in theory”, but mixed setups were never fully tested: https://github.com/openucx/ucx/discussions/9985
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C Networking discussion
C Networking related posts
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Two ARM64-specific compiler optimization bugs, in GCC 15/16 and Rust, hit curl
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I Am Often Wrong
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Vssh: Add SSH:// scheme for remote command execution
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Multiplayer Networking Resources
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From one blocking accept() to epoll: a C TCP server up the I/O ladder, measured
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Curl will not accept vulnerability reports during July 2026
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FRRouting – implements and manages various IPv4 and IPv6 routing protocols
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A note from our sponsor - SaaSHub
www.saashub.com | 9 Oct 2026
Index
What are some of the best open-source Networking projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | libcurl | 43,036 |
| 2 | libuv | 27,225 |
| 3 | KCP | 16,928 |
| 4 | coturn | 14,453 |
| 5 | Mongoose | 13,071 |
| 6 | libevent | 11,960 |
| 7 | MultiplayerNetworkingResources | 8,723 |
| 8 | cjdns | 5,418 |
| 9 | libwebsockets | 5,331 |
| 10 | frr | 4,314 |
| 11 | netcode.io | 2,595 |
| 12 | facil.io | 2,407 |
| 13 | Onion | 2,085 |
| 14 | gsocket | 1,929 |
| 15 | ucx | 1,718 |
| 16 | miniupnp | 1,606 |
| 17 | ngtcp2 | 1,523 |
| 18 | librg | 1,500 |
| 19 | virtualbox | 1,429 |
| 20 | netsniff-ng | 1,422 |
| 21 | picosnitch | 1,005 |
| 22 | nanoMODBUS | 914 |
| 23 | ENet-CSharp | 909 |
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