My work happens mostly as research, teaching and consulting. Written artifacts are available as articles on this site.
Artifacts of my past and current academic work, including teaching materials and publication record, are available on this separate web site.
The remainder of this page summarizes self-contained projects that I have supported or contributed to.
Software
Open source contributions
Projects that I have driven:
| Project | Description | Techs | Period |
|---|---|---|---|
| Timecond | Library for time range management | Typecript | 2025 |
| Break the ice | Social networking and event management system | Python | 2024-2025 |
| go-libedit | Go wrapper around the BSD libedit library. | Go, C | 2017-current |
| cockroachdb / errors | Replacement errors library for Go aiming to provide network
portability of error objects. |
Go | 2019-2023 |
| SL toolchain | Compiler, core library and OS components for the SL language and Apple-CORE / Microgrid project. | Python, C, assembly | 2009-2020 |
Projects to which I have made significant contributions:
| Project | Description | Techs | Period |
|---|---|---|---|
| CockroachDB | Distributed SQL database engine. | C++, Go | 2016-2023 |
| CockroachDB docs | Reference documentation for CockroachDB. | Markdown | 2017-2023 |
Projects over which I maintain stewardship but without recent major activity:
| Project | Description | Techs | Period |
|---|---|---|---|
| spkrd | Network server for the FreeBSD speaker device | Rust | 2025 (stable) |
| shakespeare | Scenario-based testing framework for distributed processes. | Go, Unix processes | 2019 (stable) |
| go-binsize-viz | Go executable size visualization using D3. | Go, D3, Javascript | 2019 (stable) |
| cppbench | A benchmarking facility for C++ like Go’s go test -bench. |
C++ | 2018 (stable) |
| go-strtime | Stable strptime / strftime functions for Go. |
C, Go | 2017 (stable) |
| compose-text | Text templating for Go using functional combinators. | Go | 2017 |
| MGSim | Fast cycle-accurate simulation of multi-core, microthreaded systems. | C++ | 2009-2017 (stable) |
| Programming proficiency test | Automated survey to assess programming proficiency. | Python | 2014-current |
| io::align | C++ library and command-line utility to automatically align columnar output in text streams. | C++ | 2013 (stable) |
| io::fmt | printf-like formatting for C++ I/O streams. |
C++ | 2013 (stable) |
| Passphrase generator | Opie implementation of the Diceware algorithm to generate passphrases in multiple languages. | Shell script | 2003 (stable) |
Other software projects
I have made major contributions to the following projects, which are unfortunately not published as open source:
| Project | Description | Techs | Period |
|---|---|---|---|
| Roachdash | Internal tool used by the CockroachDB team to monitor issues and pull requests on Github. | Go, Javascript | 2018-2019 |
| Roachdir | Internal directory used by the CockroachDB team to search and retrieve contact information for CockroachDB contributors. | Python, Javascript | 2018-2019 |
Non-technical projects
| Project | Description | Period |
|---|---|---|
| dr-knz.net | This web site. | 2020-current |
| The dot on the ceiling | Personal blog. | 2003-current |
| Tengwar for Lojban | Application of Tolkien’s Tengwar writing system to the constructed language Lojban. | 1999-2006 (stable) |
| Jboski | Web interface for the jbofi’e Lojban-to-English translator. | 2002-2005 |
Community work
| Project | Description | Period |
|---|---|---|
| SAC Mailing lists | Mail hosting for the project mailing lists of the Single-Assignment C (SAC) project. | 2017-2020 |
| Leerlijn Informatica vaardigheden | Knowledge and education database for CS Bachelor students at the University of Amsterdam. | 2015-2017 |
| Apple-CORE | Web hosting for the research artifacts of the EU-funded Apple-CORE project. | 2012-2022 |
| Coding style specification for EPITA (sources) | Programming style standard for the EPITA students. | 2001-2003 |