I am looking for a program that calculates the different significant dates for hilchos Niddah based on the information you give it.
My criteria are as follows:
- Must be free
- Must be PC compatible (i.e. for Windows; not a smartphone app)
- Must have options to customize whether or not to take into account different opinions and stringencies
- Must have letters of approbation from at least one recognized Rabbi (I realize this term is vague, but it will at least set a certain minimum standard)
- Must not require programming knowledge in order to be able to use it and customize it
I am aware of several programs, but none of them meet all, or even most, of my criteria.