What systems are used to schedule aircraft into maintenance

[phnuff]

I am not sure if this is the right forum, or even if it is an acceptable question, but I am sure if it is unacceptable, someone will tell me 'go away(and I would'.

My question is , what computer systems do airlines use to schedule aircraft in for the various checks/maintenace they have to go through? Is they home built or are they off the shelf from someone - and if so, from whom.?

Thanks (and maybe sorry for the question )