Fault Tree Analysis Calculations

Hi, GA community!
As a RAMS engineer working for reliability, maintainability and safety documentation for Type Certificate, I'd like to know your takes on FTA calculation aids.
I know there are a number of software platforms in the field and I'd like to know your inputs. Until now I've had the chance to work with the major ones (PTC Windchill, Robin RAMS, Isograph), but I was wondering if there is a list of accepted platforms. I know EASA does not really certify them. There are no accepted or non-accepted tools, but companies are reluctant to move away from the most common industry tools.
Also, do you have experience with EASA inspectors refusing calculations because they came from a certain software?
Many thanks to everyone!
J. V.

I personally use cosyra (cosyra.de) for FTA, which is kinda old and non commercial. Anyway it does the job for me. I have no real experience with acquiring a Type Certificate yet. But I would guess the tool doesn't matter, since you deliver the FTA as a formal prove of the failure/reliability probability for a respective DAL level, which ultimately is just mathematical construct independent of the tool used. I would expect the EASA inspectors to be able to recalculate and check the failure probabilities of your FTA against your denoted probability anyway, since all correct tools result in the same right probability.