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Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.
A developer-friendly API for converting many document formats into PDF files, and more!
Sketch and take handwritten notes.
Gaphor is the simple modeling tool
Animated, explorable diagrams for Claude and other coding agents, from a short JSON spec.
A most fully customization calendar for Apple platforms 📅
Clendar - Minimal Calendar app. Written in SwiftUI.
🐘 A PHP client for interacting with Gotenberg.
Ionic 5 - social network starter project
.NET Library to drive the awesome PDFtk binary.
Graph Drawing DSL (or Graphviz Interface) for Common Lisp.