Here are some pages created by Tilman Piesk a.k.a.
<a href="https://commons.wikimedia.org/wiki/User:Watchduck">Watchduck</a>.

<ul>
    <li>
        <a href="http://paste.watchduck.net">paste</a>:
        old static content
    </li>
    <li>
        <a href="https://drag-dag.watchduck.net">drag-dag</a>:
        <abbr title="Backend: Django REST framework">DRF</abbr>/<abbr title="Frontend: Vue.js">Vue</abbr> app to create directed acyclic graphs
    </li>
    <li>
        <a href="https://tree-table.watchduck.net">tree-table</a>:
        <abbr title="Backend: Django REST framework">DRF</abbr>/<abbr title="Frontend: Vue.js">Vue</abbr> app to turn formulas into tree shaped tables
    </li>
    <li>
        <a href="https://prolog-trace.watchduck.net">prolog-trace</a>:
        <abbr title="Backend: Django REST framework">DRF</abbr>/<abbr title="Frontend: Vue.js">Vue</abbr> app to turn Prolog console output into tables
    </li>
    <li>
        <a href="https://old-brainball.watchduck.net">old-brainball</a>:
        Django app to emulate a twisty puzzle
    </li>
    <li>
        <a href="http://ng-ex.watchduck.net">ng-ex</a>:
        Angular exercises
    </li>
</ul>