Wikipedia
Jarnal is an open-source cross-platform notetaking and sketching application similar to Windows Journal. It is written in Java.
Jarnal can be used with mouse or graphics tablet for freehand notetaking or it can be used for annotating imported PDF files and other imported pictures. It has a feature for recording pen strokes and playing them back as an animation. Recordings can also be saved. Various tools exist for helping freehand usage like graph paper, ruler and arrow tool. Jarnal has handwriting recognition but it also accepts keyboard input for entering text. It supports collaborative writing; a feature that allows multiple authors to edit a single file in real time over a network.
Jarnal was created by David K. Levine and Gunnar Teege and it is in active development. Version 9.99 was released in November, 2010 and the current version is 10.73.
Perhaps because of the SVG features, a Windows user can expect a memory footprint exceeding 400Mb when Jarnal is running on the desktop. The current footprint of Evernote is often slightly less (<400 Mb on startup) which contrasts with Microsoft OneNote which (version 2003) can be expected to be under 120Mb on startup. This can be an issue on older laptops with one processor and 1Gb or less of RAM when many applications are running while the user is on-line with a conventional multi-tab web browser (some of which are now also multi-process, that being another issue for single-core CPU laptop users.)
Jarnal was originally released into the public domain, but since version 2.71, it was then released under the GPL. The package hosted for the user to download contains the source code of the program. Jarnal's website gives instructions on how to find the source files within the program by means of unpackaging it.