ZEMANIM FOR DAVENING
Chai Tables
This website contains tables of visible sunrise & other halachic zemanim for Eretz Yisroel and other places all over the world with important Jewish communities or that are important to Jewish travelers.
There is also a special section for airplane travelers which calculates the zemanim during air travel between specified airports based on date, departure time, arrival time, etc.
O U Calendar
This section of the Orthodox Union (O U) website contains a 25 year calendar with a list of Jewish holidays and daily and Shabbos zemanim.