Periodic Calendar, a GPL’ed GUI application, coded in Java that helps keeping track of women menstrual cycles and predict fertility periods, has just entered Debian. This information can be used as supportive either for conception or contraception planning.
This program (pcalendar in Debian) is by far more complete than mencal (a simple menstruation calendar that can be run in the console) or cycle (a windowed calendar that can calculate stuff based on the length of the cycle or on statistics of previous periods), and provides support for BBT and sympto-thermal methods, which have the highest reliability in fertility periods prediction. User can thus choose any subset of the features to be used or even fall to the generic calendar method (which if used alone is very unreliable).
Keep in mind, though, that -as the authors of the program insist on- Periodic Calendar is NOT an equal substitute to the fertility planning consultants or doctors, and methods used are not 100% effective. It’s a useful program, anyway.
I’ve also translated the program into Spanish, made some cute icons and added MIME support so that data files can be easily open from the desktop.