Alternatives

Products that do what The Gnuk Smartcard Based on the STM32F1x and Geehy APM32 does

Sign, authenticate and encrypt with a USB dongle at the cost of a soda. The goal here was to easily program around ~20 Gnuk devices at the budget of a single dongle of the commercial solution. Contains every step and fixes to get it running on current and next Ubuntu and Debian versions.

1. 1
   YubiKey NEO▲102

   Hardware-based authentication

   2018

2. 2DA
   DonglePi, a USB Stick Giving You the Raspberry Pi IOs on a PC▲92

   2015 · github.com

3. 3TB
   TinyPilot – Build a KVM over IP using a Raspberry Pi▲756

   2020 · mtlynch.io

4. 4MM
   My microkernel-based OS built from scratch now has basic Unix commands▲69

   This project contains no code from Linux, BSD, Minix, or any other OS. Everything up until this point is written entirely from scratch, including a pure microkernel (that only implements multiprocessor priority scheduling, memory management, and interprocess communication), a work-in-progress implementation of the standard C library, and a variety of servers that provide drivers and other essential OS functionality. At the time of writing this post, the servers provide drivers for the keyboard, NVMe SSDs (that works on real hardware), a Unix-like virtual file system (with a single root…

   2024 · github.com

5. 5IZ
   Icepi Zero – The FPGA Raspberry Pi Zero Equivalent▲233

   I've been hacking away lately, and I'm now proud to show off my newest project - The Icepi Zero! In case you don't know what an FPGA is, this phrase summarizes it perfectly: "FPGAs work like this. You don't tell them what to do, you tell them what to BE." You don't program them, but you rewrite the circuits they contain! So I've made a PCB that carries an ECP5 FPGA, and has a raspberry pi zero footprint. It also has a few improvements! Notably the 2 USB b ports are replaced with 3 USB C ports, and it has multiple LEDs. This board can output HDMI, read from a uSD, use a SDRAM and much more.…

   2025 · github.com

6. 6TS
   The SC4-HSM, a fully open USB hardware secure module▲137

   2016 · sc4.us

7. 7FA
   FlopperZiro – A DIY open-source Flipper Zero clone▲364

   2025 · github.com

8. 8SD
   Simple demo of a cold boot attack using a Raspberry Pi▲127

   2024 · github.com

9. 9VG
   Vanity GPG Keys (and help fund GnuPG!)▲21

   2015 · vanitykeys.io

10. 10AG
    A GTK+ 1Password App for Linux▲47

    2015 · github.com

11. 11KA
    Kryptonite – a new home for your SSH private key▲338

    2017 · krypt.co

12. 12AV
    A virtual Yubikey device for 2FA/WebAuthN▲166

    2022 · github.com

13. 13
    OnlyKey DUO▲88

    Open source Yubikey alternative with dual USB-C and USB-A

    2021

14. 14BA
    Bitdog – a completely hackable home automation toolset▲30

    Hello Hacker News, My co-founder and I have spent the better part of years developing a completely hackable Home Automation toolset that runs on a Raspberry Pi, or any machine running Linux. With just a Raspberry Pi and a $45 Z-Wave dongle (https://www.amazon.com/Aeotec-Z-Stick-Z-Wave-create-gateway/...), you can run a complete home automation system! Our hub will support any Z-Wave or Z-Wave plus device. We are cloud hosted service that doesn't require you to purchase any proprietary hardware. Our hub software runs on NodeJS and is completely open source. We encourage…

    2018

15. 15
    OnlyKey▲118

    OnlyKey is an open source alternative to YubiKey

    2019

16. 16MA
    Misocoin – A barebones Bitcoin-like protocol implemented in Python 3.6▲151

    2017 · github.com

17. 17IB
    I built an encrypted BLE dongle for pasting stuff to air-gapped devices▲5

    Definitely one of those "20 minute adventure gone wrong" projects where all I wanted initially was a quick wireless rubber ducky for bitlocker keys and the like and then I kept adding stuff like AES-256..... Currently working on adding WebAuthn/FIDO support because the hardware is already there and scope creep is a lifestyle at this point. Would love feedback, especially on the security side. Repo and PCB files are fully open source.

    Jul 2026 · github.com

18. 18OT
    On the security of the Linux disk encryption LUKS▲31

    In the past few days, there have been uncertainties and concerns about the LUKS (“Linux Unified Key Setup”) disk encryption, which is widely used on Linux. We publish our assessment of this here.

    2023 · dys2p.com

19. 19IB
    I built a toy TPU that can do inference and training on the XOR problem▲134

    We wanted to do something very challenging to prove to ourselves that we can do anything we put our mind to. The reasoning for why we chose to build a toy TPU specifically is fairly simple: - Building a chip for ML workloads seemed cool - There was no well-documented open source repo for an ML accelerator that performed both inference and training None of us have real professional experience in hardware design, which, in a way, made the TPU even more appealing since we weren't able to estimate exactly how difficult it would be. As we worked on the initial stages of this project, we…

    2025 · tinytpu.com

20. 20AM
    A miniature Linux distro for non-rooted Android devices▲94

    2013 · kevinboone.net

21. 21MA
    Monolinux – A tiny embedded Linux distro▲69

    2019 · github.com

22. 22AT
    A tiny LLM running at 21,000 tok/s on a $250 FPGA (Live Demo)▲79

    A 3.16M-parameter INT4 transformer running entirely in the on-chip memory of a Xilinx Kria KV260. Zero DRAM in the token loop, 59,965 tok/s on the fabric, bit-exact. Chat with it live.

    28d ago · mikeayles.com

23. 23LA
    Lego – A Let's Encrypt Library and CLI in Go▲93

    2015 · github.com

24. 24TC
    Tiny C runtime Linux (rt0), HelloWorld 0.6k (i386), sbrk example added▲49

    2015 · github.com

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