Software

Open-source software tools I have built or maintain:

dragon , a drag and drop source/target for X11. dragon file.jpg creates a window with a single entry you can drag into a file manager or web browser.
retail , a POSIX-compatible tail with regular expression support. retail -r REGEX will output the part of the file starting at the last match of REGEX, and retail -f -r REGEX1 -u REGEX2 will output the part of the file starting at the last occurrence of REGEX1, and keep outputting until REGEX2 matches.
jqjs , a JavaScript implementation of the jq query language, implementing the core language features in pure JavaScript that runs in the browser .
Kernan and Minigrace , two implementations of the Grace language.
Tiled Grace , a block-based editor for Grace.
domejs , a JavaScript DOM library using proxies to make common operations shorter while still resembling the standard DOM API.
A regular expression analyser that runs in the browser, showing both NFA and DFA for a regex and simulating them against strings.
Exploratory tool for the 2020 New Zealand general election results , down to the level of individual polling places.