I signed up for Buildium, the property management tools are good:  I like keep tracking of my leases, leases that are maturing soon, tenant contact info, electronic payments, and tenant screening tools are easy to use and help to keep me organized. 

A lot of great options out there for self-managing if you decide to go that route; aside from providing the basics (listing, tenant screening, digital lease creation, rent collection, and maintenance tracking) some self-management services/tools also offer your tenants additional capabilities which makes it an easier sell on your end when getting them to transition over (ie. their ability to report on-time rent payments to the credit bureaus).

What tool do you use to determine the total property tax of an property?

@Art Perkitny What tool are you using to generate that heat mak of rent to price ratios?

I am looking for a low cost(I can create the site myself) option which has all the IDX and lead generation tools. 

While pre-screening is a great tool, I wouldn't jump to the conclusion that they are bad property managers.  

They're huge tools of leverage.

You'd never be able to prove they did it unless you could find a judge that would summon the tenants cell phones in discovery hoping that one of them was recording "for the Gram" when the incident tool place.

Like anything else they're a tool and can help.

I find that it is not always 100% accurate, but it is another quick and easy tool to use to get a general idea about rents in your area.