The "Date Calendar" is very useful - you input information into two of the three fields and tap the keyboard icon to get the information in the third field:
In the screen above, I entered two dates and found out how old I am. If I had entered, say, a death date and an age at death, the tool would calculate a birth date.
The "Relationship Calculator" is also very useful. You select two persons from the list of names in the database and tap the "Calculate" button and see the relationship:
On the screen above, I picked a person at random and myself, and saw:
It took awhile (at least a minute) for the App to tell me that we weren't related. Still, it is useful.
The "Soundex Calculator" is also useful if you need the information. You put a surname in the field, and tap "Calculate" and the Soundex code is calculated (true Soundex, plus an alternate Soundex code):
The last Tool is the "Calendar." The user select the month and year and see the calendar for that month: