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Xournal is a GTK+/Gnome application for notetaking, sketching, keeping a journal using a stylus on Tablet PCs and other platforms. It aims to provide superior graphical quality (subpixel resolution) and overall functionality.
Purple Koala is a free and open source cross-platform simple drawing and painting software.
Part of Purple Animation Tools by O. Bahri Gordebak (purplehuman).
See Wiki for details.
Note that Sourceforge project page doesn't always show the latest download. Please click Files above and browse files before download.
Latest version is 1.5 right now.
AprilBrush is a Qt-based application for digital painting with support for layers, brush libraries and multi-page, written in C++/JavaScript/QML languages. The program saves the image files in the format OpenRaster and can also export them to PNG. Required a pressure sentive input device (graphic tablet).
Source code can be find in a git repository:
https://github.com/krre/AprilBrush-Desktop
NoteLab is an advanced "digital notebook" specifically designed for tablet computers. With its stroke smoothing, antialiasing, and "smart rendering," NoteLab provides a beautiful and powerful note taking environment on any operating system.
*** THIS PROJECT IS DEAD ***
But try http://drawpile.net/ instead! It's also open source and has made a 1.0 release.
*** ***
CjopazeDraw is a real-time Internet collaborative drawing tool in the vein of openCanvas, pchat, or flockdraw, but designed with full cross-platform thick-client graphics tablet support, fast synchronising, and per-user undo and redo.
Qaquarelle is the opensource Qt4-based graphical editor, whose goal is to provide the native way of painting with emulated traditional instruments, including the full support of tablet input and OpenGL-based processing in GPU.
Jarnal is a plattform-indepenent programm written in Java for notetaking, sketching and PDF-/picture-annotating. It works like a normal notepad with the difference of being digital. It is thought to be used with a stylus on tablet-pcs.
BTNotes is a Pure-Java notes-taking application for use with a tablet pc or pen input devices like Wacom. You can export pages to PNG or store in binary files.