Thanks for your reply. What I mean is any online software (I don't have to install it on my own computer) I can use to generate a rent payment schedule based on the rental contract and using that schedule to record the rent payment and track the payment history. I also can use that software to load my rental property related expenses and get my tax position for the property based on the rental income and property expenses(how much profit or loss in the financial year).

I agree, spreadsheet can do a lot of things to help manage the numbers about the properties. Even doing some feasibility study and cash flow forecast but it can't use the history data to analysis. I hope I do make some sense now what I am looking for.

Cheers,
Peter