FeedbackSpark's answer:
Range of powerful features designed specifically for digital product teams:
Ovulation calendar online - Calculate your periods and find out when you are most likely to get pregnant!
Back Market - the refurbished (super) market
IOvulation Calculator - Ovulation calculator predicts your ovulation date, fertility window, next period, intercourse window, safe period, and due date based upon your menstrual cycle.
Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
Ovulation Calculator - Ovulation Calculator, Fertility Resources, and Facts on Pregnancy Tests and Ovulation Predictor Kits
Google Forms - Simple web forms from Google.