This is a business and there is an art to dealing with people to get what you want in the quickest and easiest fashion possible.

The tools you listed are, at the moment at least, the best options out there in conjunction with good old fashioned research. 

I've realized that people will behave and conduct business in any fashion they wish.

@Jasmine Lu, Crowdfunding is essentially just old-fashioned syndicating done online.

Rents don't move in a linear fashion with values but they will track direction-ally together; so, cash flow increases over time with an appreciation strategy.You can extract value/equity out of a property with a refinance...a sale or exchange is not required.The appreciation strategy is either long-term and you ride the cycles or you have to pivot at your planned exit value. 

Is it through an app, excel, or old fashion pen and paper? 

To be honest, I am not a handy person and would rather buy a unit which needs little repairs and use a management company in a "buy and forget" fashion of rental investing.

However, if you have someone that handles your books in an orderly fashion, even at year-end adjustments will be easy.Currently, I am a Developmental Controller.

The old-fashioned desktop QB is a monster that is very difficult to tame and maintain.

If you can get them to execute a DIL then offer cash for keys and have them exit the home (hopefully) in a peaceful fashion We usually don't make the CFK payment until they move out and we get a local agent to inspect the interior.