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Top 23 C++ Privacy Projects
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keepassxc
KeePassXC is a cross-platform community-driven port of the Windows application “Keepass Password Safe”.
Thanks for your reply. I do want this tech to work, so I keep hoping I'm wrong here. Unfortunately, you haven't convinced me yet.
> some of them may reject Passkeys without certain metadata or attestations. But you will find out quickly on sign up with that key.
I don't think that's applicable to the case I'm talking about. A relying party could change their implementation to ban the client you are using, after you set up the passkey.
The spec compliance at issue is the truth of the "User Verification" boolean when submitting your unlocked private key to the site for authentication. While it's true that your client could lie about this and the RP would not know, the spec authors view this as a violation of the spec, and a valid reason for RPs to ban users using that client. They even maintain a list of clients they feel violate the spec for UV.
The spec authors are very explicit that clients not meeting their standards are at risk of being blocked by relying parties. See:
>> RP's blocking arbitrary AAGUIDs doesn't seem like a thing that's going to happen or that can even make a difference
> It does happen and will continue to happen because of non-spec compliant implementations and authenticators with poor security posture.
https://github.com/keepassxreboot/keepassxc/issues/10406#iss...
The spec authors' comments on these issues make it very clear that they feel RPs may correctly block users for using clients that do not handle user data in the way the spec authors want them to. This isn't come corner case, it is explicitly built into the spec. I consider that to be incompatible with open source. It's my data and my software. It's my choice what software to use and how to handle my data.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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ricochet: A peer-to-peer instant messaging system built on Tor hidden services.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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openfhe-development
This is the development repository for the OpenFHE library. The current (stable) version is v1.2.4 (released on March 21, 2025).
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People have thought about how to do forward secrecy with PGP:
https://sequoia-pgp.org/talks/2018-08-moving-forward/moving-...
https://sequoia-pgp.gitlab.io/openpgp-dr/openpgp_dr/index.ht...
https://github.com/stealth/opmsg
https://github.com/autocrypt/autocrypt/issues/444
There's a lot going on in the space. It is more innovative than you're giving it credit for, especially around double ratchet. Not there yet, but there's a good reason why I don't mind: control. Multi client support (DeltaChat desktop, hallelujah) and the fact that email remains federation-first.
My identity definitely leaks to my server because I pay it's bill. Not only that, but most of my contacts run their own email or borrow it from me or someone else. Our data does not leave any EU countries apart from the UK. We have IM that doesn't involve any Americans.
Some might imagine we feel terribly smug about that right now :)
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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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crash
crypted admin shell: SSH-like strong crypto remote admin shell for Linux, BSD, Android, Solaris and OSX (by stealth)
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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++ Privacy discussion
C++ Privacy related posts
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Ricochet: Peer-to-peer instant messaging system built on Tor hidden services
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Passkey technology is elegant, but it's most definitely not usable security
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Organic Maps Turns 4: The Privacy-Focused Alternative to Google Maps
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Maps.me co-founder tries to close down Organic Maps open-source fork
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Organic Maps: Offline Hike, Bike, Trails and Navigation
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Ask HN: OpenStreetMap based Google Maps like alternative?
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Why Are All Tech Products Now Shit? [YouTube] [video]
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A note from our sponsor - InfluxDB
www.influxdata.com | 12 May 2025
Index
What are some of the best open-source Privacy projects in C++? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | keepassxc | 23,088 |
| 2 | monero | 9,434 |
| 3 | ricochet | 3,895 |
| 4 | fully-homomorphic-encryption | 3,567 |
| 5 | i2pd | 3,435 |
| 6 | MEGAsync | 1,709 |
| 7 | OpenScan | 1,568 |
| 8 | dash | 1,502 |
| 9 | sdk | 1,367 |
| 10 | concrete | 1,351 |
| 11 | openfhe-development | 892 |
| 12 | opmsg | 753 |
| 13 | firo | 747 |
| 14 | Speek | 743 |
| 15 | PIVX | 531 |
| 16 | mozilla-vpn-client | 513 |
| 17 | namecoin-core | 468 |
| 18 | AIJack | 389 |
| 19 | oxen-core | 326 |
| 20 | mc2 | 301 |
| 21 | Viper-Browser | 227 |
| 22 | crash | 194 |
| 23 | secure-xgboost | 105 |
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InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
www.influxdata.com