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Top 10 C++ Messaging Projects
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They explained why they did this here: https://github.com/zeromq/libzmq/issues/2376
Bottom line is that their licensing with a static linking exception was kind of weird and creating a lot of issues combining zeromq code even with other open source licenses (like Apache 2.0).
Interesting to see how they gathered permission to do this from the developer community. License changes like this are usually hard to realize unless you insist on copyright transfers. But in this case they managed to do it without that. So it was a collective decision. Hard to argue with that.
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InfluxDB
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ricochet: A peer-to-peer instant messaging system built on Tor hidden services.
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Speek
Privacy focused messenger that doesn't trust anyone with your identity, your contact list, or your communications
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C++ Middleware Writer
The repo contains library code to support messaging and serialization. There are also two programs in the repo that are needed to use the CMW.
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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++ Messaging discussion
C++ Messaging related posts
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Ricochet: Peer-to-peer instant messaging system built on Tor hidden services
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Autossh – automatically restart SSH sessions and tunnels
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ZeroMQ: High-Performance Concurrency Framework
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Lightweight and fast AMQP (0-9-1) server
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ZeroMQ – Relicense from LGPL3 and exceptions to MPL 2.0
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BlazingMQ - High performant Open Source Message Queue by Bloomberg
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BlazingMQ - High performant Open Source Message Queue by Bloomberg
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www.saashub.com | 17 Jun 2025
Index
What are some of the best open-source Messaging projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | ZeroMQ | 10,284 |
| 2 | ricochet | 3,895 |
| 3 | blazingmq | 2,676 |
| 4 | Speek | 743 |
| 5 | eiskaltdcpp | 388 |
| 6 | QtFirebase | 287 |
| 7 | conceal-core | 100 |
| 8 | C++ Middleware Writer | 73 |
| 9 | conceal-desktop | 67 |
| 10 | stuff_sack | 6 |
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