This Java app can be used to sync your HCL Notes calendar events to your Google calendar.
java -jar notes-calendar-sync.jar <path-to-your-config-file>
An example of the config file can be found here.
Make sure that you use a 32 bit Java version and add the Notes installation directory to your PATH environment variable.
The following library must be set to be able to use the Notes API.
DYLD_LIBRARY_PATH=/Applications/HCL Notes.app/Contents/MacOS