Some of the applications mentioned here do not offer integrated online help, but you can find some useful information about usage and configuration in your installed system in /usr/share/doc/package/packagename or on the Web:
For the Xournal manual, refer to http://xournal.sourceforge.net/manual.html
The Jarnal documentation is located at http://www.dklevine.com/general/software/tc1000/jarnal.htm#documentation
Find the xstroke man page at http://davesource.com/Projects/xstroke/xstroke.txt
Find a HOWTO for configuring X on the Linux Wacom Web site: http://linuxwacom.sourceforge.net/index.php/howto/x11
Find a very informative Web site about the Dasher project at http://www.inference.phy.cam.ac.uk/dasher/