Projects
I've been building and shipping open-source software for well over a decade. Here are some of the projects I'm most proud of.
Featured
These two WordPress plugins are my main products, actively maintained and used on millions of websites worldwide.
All projects
A more extensive list of projects I worked on over the years, ranging from WordPress plugins and web analytics to toy programming languages and browser extensions.
Mailchimp for WordPress
137A WordPress plugin that allows you to tightly integrate your site with your Mailchimp account. The plugin grew to well over 100.000 active users in its first year, after which I built a paid version from a hospital bed in Vietnam which turned into a huge success. It has been downloaded well over 52 million times and is in active use on over 2 million websites.
Koko Analytics
393Open-source and privacy friendly analytics plugin for WordPress that only tracks aggregated counts and keeps all data locally on the website's server. Currently in active use on about 50.000 websites.
HTML Forms
A WordPress plugin to create multipurpose forms and handle form submissions in a safe and extendible way. I grew this plugin to a healthy ~9.000 active users before selling it in early 2024.
Fathom Analytics
8,003Open-source and privacy friendly analytics. I stepped away from Fathom in 2019 as its success at the time was hard to combine with 2 young children, but the project is still going strong (although no longer open-source) and has turned into a flourishing business.
Nederlang
43An interpreted programming language with a bytecode compiler and stack-based virtual machine hosted in Rust.
Monkey-C
42An interpreted programming language hosted in C. This was my result of going through the wonderful interpreter book by Thorsten Ball.
Browserpass
1,000A browser extension for Pass, the unix password manager. I started hacking on this as I wanted to give native messaging a try, which was pretty new at the time.