Svatek

Not only will you never forget namedays of your Czech friends and relatives anymore, but you will also
1) be able to send them predefined smses and emails where names and signatures will be substituted as you wish
2) be reminded by notifications or calendar events of namedays and birthdays of the people you select (or even all of them)
3) learn interesting information about the Czech given names, their origin, alternative forms of the names
4) you can filter which groups of contacts will be used by Svatek
You are provided with a list of upcoming events, not only namedays, but also birthdays including age.
The program automatically assigns name days to the people in your contact list.
In addition to information about the names the program contains in its own database, it also provides direct link to external more detailed information about the particular names.
Of course, the program is primarily for the people who are Czech or have lot of Czech friends, but anyone interested in the Czech Republic or Czech language might benefit from it.
Or maybe even if you don't know anyone Czech, you might still benefit from the clever and flexible predefined smses and emails when your friends have their birthdays.