You can use FBCalc program for free!
If you think it is useful to you and want to continue its grow,
please help me to improve my program.
How can you help develop this program?

There are many different possibilities for cooperation.
Here are some of them:

1. Design your own patterns using my program, fill in the attached file "tests.xls" and send it to me via e-mail.
2. Send comments about the errors in the program.
3. Send ideas for additional options.
4. Donate any amount to my bank account:
   numbers of accounts