I build and share these tools. You may want to have a quick look at:

Compose CSS might also be interesting for you, but expect this to change often, as it is currently in early stage. I´m trying to find out for myself what is useful to have in a CSS library and how that lib should be structured. ulf.codes is created by using Compose CSS.


A markdown-it plugin to wrap any <table> into a <div> for horizontal scrolling on narrow screens.


A markdown-it plugin to set aspect-ratio of responsive images, make them lazy loading, and to make videos responsive.


Highlight your TOC entries while scrolling.

Compose CSS

A composable CSS Toolkit to build fast, maintainable, and responsive websites.


Draw SVG stacked area diagrams with a day-based x-axis.


Draw SVG cumulative flow diagrams and predict the anticipated completion of work.


Draw a SVG horizontal gauge.


A sorted map and a sorted set, implemented as a binary tree.

Breakdown for Atom

Display and manipulate a breakdown structure of your JIRA Scrum project – even offline and only eventually connected to your JIRA system.


Make the header of your web pages dynamic.


File your workout routines and get a nice graphical overview of your achievements and improvements.


A virtual whiteboard to be shared by multiple people at the same time. Users will be anonymous – so no one needs to sign in.