I cannot state enough how helpful ChoiceworksCalendar has been. It is fantastic for every day use.
When you click on a calendar item, it says the event out loud. You can make the schedule as detailed or as limited as you like. You can create multiple calendars for daily activities or you can make an overview calendar for just the big holidays. It has a Countdown feature which my son absolutely loves to use to see when things are coming up (like Christmas and birthdays).
My husband and I divorced last year and at the end of each day I put an entry for where they will be spending the night. During the school year it is pretty straightforward, but when you add in summer vacation and dad's extra long visitation during summer, things get a little complicated.
When you click on the day that you are on, you can slide items from the left to the right and it will say "all done" and put a checkmark over that item.
My boys are like me in that they are very visual. This calendar enables them to see you things that are coming up in the future such as therapy, doctors appointments, vacations, anything important.
It is fairly easy to import and export the calendars so I have the master calendar on my iPad and I will export it to both of my boys using dropbox (usually) so that we all have the same calendar and I can update easily when they are using their iPads. In addition, you can send copies of the calendar as a PDF in case caretakers don't have ChoiceworksCalendar .
No matter how severely disabled your child is, I believe this calendar can make a huge difference in their ability to understand their schedule.
I don't normally leave reviews, but this has been a lifesaver since my divorce.