Here are some pages created by Tilman Piesk a.k.a.
Watchduck.
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paste:
old static content
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drag-dag:
DRF/Vue app to create directed acyclic graphs
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tree-table:
DRF/Vue app to turn formulas into tree shaped tables
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prolog-trace:
DRF/Vue app to turn Prolog console output into tables
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old-brainball:
Django app to emulate a twisty puzzle
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ng-ex:
Angular exercises