My first attempt...

I found MuseScore yesterday. It is perfect for my needs: harmonizing the dreadful one-voice scores I'm given to accompany the Sunday services in my local catholic church, here in the South of France.

Below is a score I got on Thursday, and my MuseScore version. I play tomorrow and I have no time to convert my score to three staffs (for pedal organ, the template for which I found an hour ago). Next time...

I am seriously impressed with MuseScore. And the price is right!!