I’ve been using “Provestor” but have not been terribly happy with them. They have an in-house software system you can log into to add basic data about your property, tenancy, mortgage and also anything related to accounting. They also act as an agent and file stuff with the government.
They’re pricey (especially if you have a single property, as pricing does not change with number of properties), the software isn’t great, and the service can be mediocre.
I use “Crunch” for another company in another industry. Crunch is similar to Provestor but more general, they don’t focus on any specific industry. Their service has been amazing and they have cheaper plans. But you’d have to self manage any specific property features that Provestor has, such as a place to keep track of your property, related certificates, tenancies, mortgages, valuations, etc.
What do others use? I expect many, especially those with more experience, will self-manage everything. The minimum for me is to have a system that manages making tax digital. A very nice bonus is to have accountants available to act as your agent and for advice, who can integrate with that system directly, and you receive reminders for important filing dates.