ER-Evaluation (Python package on PyPI): Toolkit for the (statistical) evaluation of entity resolution, record linkage, and micro-clustering models.

StreamlitSurvey (Python package on PyPI): Streamlit apps can be a bit tricky to get right. Especially if you want multi-pages forms/surveys that keep track of progress and that can be restored from a saved state. This Streamlit component makes it easy to incorporate more complex forms on in your apps.

StringCompare (Python/C++ package): Most implementations of the Levenshtein distance are pretty bad. Here's how the basic algorithm can be implemented with minimal time and memory complexity.

CSVMeta (Python package on PyPI): You know how excel has been repeatedly blamed for high-profile disasters? Well, CSV files are part of the problem. If you're going to use CSV files, you need to specify your CSV dialect in a metadata file. This package reads/write CSV files with attached dialect information.

assert (R package on CRAN): Informative assertions in 16 lines of code with some R introspection magic (no dependencies!)

cache (R package on CRAN): On-disk caching for data science workflows in 15 lines of code (no dependencies!)

dgaFast/dga (R package on CRAN): I needed the dga R package (that I know maintain) to go fast. I re-implemented bottlenecks in C++ and did some linear algebra magic for a 100x speedup.

Fractals (Javascript App): More than 10 years ago, I deep dived into browser multithreading to create a Javascript Mendelbrot set visualization app.

Welcome to the Moon App (Javascript App): I love board games! I created this app as a companion to the wonderful Welcome to the Moon board game.

FingermatchR (R & C package): Ever needed an R wrapper to fingerprint matching C libraries? No? Well, a Duke postdoc did and sweet-talked me into building this... It may not be the most useful thing, but it was interesting!