I use BP's tenant screening tool and its worked great. 

If you go to a credit scoring tool such as the one that exists on myfico.com and play with the parameters you will see what I am talking about.

This should answer your questions:  https://www.biggerpockets.com/rei/pay-rent-online-payment-tools/

I guess one of the biggest lessons that I have learned in the real estate field is the usefulness of leverage as a potentially helpful, but also potentially harmful tool.

Holly,Marketing is a simple matter of using the same tools over and over; direct mailers, phone calls, more direct mailers, post cards, etc. etc.Build relationships.

You're looking for a cash flow analysis tool.  

I would be interested in using this scraper tool how does one get access to this data mining technique for locating motivated sellers.

The downfall of flexible systems.The more you extend it and use 3rd Party integrations the more tools you have to keep track of.  

The RE world really needs a comprehensive visual analytics tool. 

Currently I have a single one and am looking to acquire a 3 or maybe 4 flat here in Chicago, or another couple of properties in Kentucky.There are a few things l'd like to have:Tenant portal for announcements and service requests / status bits and paymentsMisc expense tracking of consumables for a property for maintenance and general upkeepTrack recurring costsSome tools to visualize the cash flowsI could do it manually, but know it would be possible to, for a given property, generate more or less the total ROI ie: "Over the past 4 years, this property has paid for itself and generated $YY in income" or maybe "When full, this 4 flat generates $ZZ worth of income, but averages $BB in expenses due to maintenance", etc.The other option, which I'm entirely comfortable with (I'm a software engineer by trade and have worked in this industry for 10+ years) is simply writing my own and likely then open sourcing it (aka giving it away for free).What are everyone else's lists of "must have" vs "nice to have pony features"?