There are 2 repositories under brushes topic.
(LEGACY) Quake .map support for Godot 3.x
Unlock custom brushes, natural fill effects and intuitive hatching in p5.js
Crayon is a canvas brush based on an awesome framework Fabric.js
The open-source, cross-platform level editor for id Tech based games.
SyntaxHighlighter4 plugin for DokuWiki
Android finger paint library.
This is a plugin for Paint.NET that extends it with dynamic brush capabilities. Images can be used as brushes to draw with options to adjust and jitter the brush in different ways.
razcore-rad's Krita resources: brushes, paintoppresets, palettes, workspace, etc.
Slick Painter is a tool for runtime drawing in Unity, written in C#.
This is a plugin for Paint.NET that extends it with the ability to draw filters using dynamic brush behavior.
Use ChatGPT to implement ScribblerToo brushes
Creative Painting and Sculpting Brushes
MyPaint brushes to help with painting with a mouse device
Data visualization course TA. Colorspaces, brushes, and histograms. Solution.