Task Coach is a simple open source todo manager to manage personal tasks and todo lists. (GPL)
Linux - FreeBSD - Windows - macOS
Xournal is a GTK+/Gnome application for notetaking, sketching, keeping a journal using a stylus on Tablet PCs and other platforms. (GPL)
Linux - FreeBSD
Zim is a WYSIWYG text editor written in Gtk2-Perl which aims to bring the concept of a wiki to your desktop. (GPL)
Linux - FreeBSD
4 applications