| Billings Centre http://www.billings-centre.ab.ca Presents the Billings method for planning for future conception, includes a list of instructors in Canada. | |
| Billings Life http://www.woomb.org Covers the Billings Ovulation Method of natural family planning, research papers and teaching material, identifies teaching locations other countries. | |
| Billings Ovulation Method Association http://www.boma-usa.org Information about this method and access to instructors who assist couples achieve future conception. | |
| Family of the Americas http://www.familyplanning.net Discusses natural family planning through the ovulation method. | |
| Feminist Women's Health Center http://www.fwhc.org Fertility Awareness Method (FAM) for natural birth control. | |
| Fertility Awareness Center http://www.fertaware.com Non-profit group providing information on the method and steps to learn fertility awareness from a non-religious perspective. | |
| Fertility Circle http://www.fertilitycircle.com Fertility Circle we bring you online fertility charting, ovulation calendar and natural family planning. Whether trying to become pregnant or trying to avoid pregnancy, we are here to help you. | |
| Fertility Wizard http://www.gleeson.us Fertility calculator gives daily estimates based on menstrual cycle. | |
| Fondation SymptoTherm http://www.symptotherm.ch Swiss organization offering support and information on the Sympto-thermal method. | |
| Hormonal Forecaster http://www.hfc.itgo.com Charts fertility to avoid or achieve pregnancy. Also generate personal statistics, and forecast future moods and behaviors. | |
| National Association of the Ovulation Method of Ireland http://www.naomi.ie Helps women learn how to manage their own fertility through monitoring body changes. Includes details of the Billings method of self-examination. | |
| Natural Conception Control http://www.usmev.com.au The Dr. Eugen Jonas method. Provides details on how to use observations of natural cycles to accomplish contraception or to select a future baby's gender. | |
| Natural Fertility of New Zealand http://www.naturalfertility.co.nz Teaches natural fertility awareness for couples trying to conceive or trying to avoid pregnancy. | |
| Natural Methods http://www.gynob.emory.edu Emory University School of Medicine review of abstinence, fertility awareness, breastfeeding, outercourse, and withdrawal as methods of birth control or child spacing. | |
| The NFP Files http://nfp.freehostia.com Collection of FAQs, articles, links, resources, and organizations that explain natural family planning as an alternative to contraception, sterilization and abortifacients. | |
| Twin Cities Natural Family Planning Center http://www.tcnfp.org Information on Ovulation Method, human fertility cycles, and other non-chemical approaches to family planning. | |
| Web Womb http://www.webwomb.com Fertility indicator and pregnancy tests. Information on the Fertility Awareness Method. Product, contact information and charts. | |