Open Source

A selection of our own initiatives and our contributions to open source projects
Open source software is a crucial part of all our technology, from web applications to embedded software. Over the years our software stack might change; the open source basis remains. Where we can, we do our part to make the open source community even stronger.


Sudo-rs is a memory safe implementation of sudo and su, a project by Prossimo jointly implemented by Ferrous Systems and Tweede golf.

Read more in this blog post.


MailCrab is an email test server for development, written entirely in Rust.

MailCrab was inspired by MailHog and MailCatcher. It uses Axum for the backend and Yew for the frontend.


ntpd-rs is an open-source implementation of the Network Time Protocol completely written in Rust, with a focus on exposing a minimal attack surface. This video explains how ntpd-rs brings NTP into the modern era.

The project was initially funded by ISRG's Prossimo, as part of their mission to achieve memory safety for the Internet's most critical infrastructure. The NTP initiative page on Prossimo's website tells the story.

ntpd-rs is part of Project Pendulum. In July of 2023 the Sovereign Tech Fund invested in Pendulum, securing development and maintenance in 2023, and maintenance and adoption work in 2024.



Rust 101

Rust 101 is a university course for computer science students, introducing the Rust Programming Language, and is available for anyone who wants to teach Rust.

Have a look at our blog post introducing the course.


Folkert works on Roc and is one of its main contributors. Roc's goal is to be a fast, friendly, functional language.


Statime is an initiative of Tweede golf, an open-source implementation of the Precision Time Protocol (PTP) in Rust.

High-precision timing is part of crucial networking infrastructure. With Statime we provide a memory-safe alternative for existing implementations.

The first milestones of the project were kindly co-funded by the NLnet Foundation.

Statime is part of Project Pendulum. In July of 2023 the Sovereign Tech Fund invested in Pendulum, securing development and maintenance in 2023, and maintenance and adoption work in 2024.





An embedded-nal implementation for the nRF9160 (built on top of the nrfxlib rust crate).

Other than exposing the NAL, it also implements enabling and disabling the modem when required automatically.





A set of rust crates for making stack dumps and getting stack traces out of them.

Developed and maintained by Dion.





Rust library for interfacing with IRMA servers.

IRMA is a set of free and open-source software projects implementing the Idemix attribute-based credential scheme, created by the Privacy by Design Foundation.

It allows users to safely and securely authenticate themselves as privacy-preserving as the situation permits.


Developed by Ruben, RP1 is a procedural macro that generates a set of useful basic CRUD (Create-Read-Update-Delete) endpoints in a REST-like API with JSON output.

Check out the blog post RP1: an experimental Diesel-based CRUD for Rocket, for more.


TGuard is a web-based sending and decrypting service for irmaseal-encrypted messages that is currently in development at Tweede Golf.

TGuard utilizes IRMA to allow a user to encrypt messages client-side. These messages can be decrypted client-side once the receiver proves to be the owner of attributes the message was encrypted for, like an e-mail address, name, or an identifying number.


For ID Contact we researched the possibilities of digital identification: how can residents organize their personal government affairs in a simpler and more reliable way? By telephone, via chat or via a video call.

The ID Contact innovation pilot is a collaboration between the municipalities of Arnhem, Nijmegen and the Drechtsteden and knowledge partners such as the Tax Authorities and iHub (Radboud University).

Within the ID Contact team we developed the software that makes secure digital identification possible.





Driver crate for the Texas Instruments ADS1292 24-bit 2-channel low-power analog front end for ECG applications.

Cloud storage abstraction for Node.js

Developed by Daniel, storage-abstraction provides an abstraction layer for interacting with a storage; this storage can be a local file system or a cloud storage. Currently local disk storage, Backblaze B2, Google Cloud and Amazon S3 and compliant cloud services are supported.

Also see the related blog post, Cloud storage simplification and abstraction for Node.js or give the npm package a try.