I"m a big fan of Xero as an alternative QuickBooks for rentals mainly due to much lower cost and still having a robust accounting software.

Hands down, Left Main/Salesforce is the most robust CRM.

But suburbs are very robust for us new home builders. it is coming back slowly but it will come back if the city just gets their act together with law and order. which is starting to happen the ultra liberal politicians are losing local elections.

Diversify Your Accounts: Consider spreading your funds across multiple accounts, including those held by established banks with robust regulatory oversight and deposit insurance.

Property radar is very robust and real. 

Jude’s keep the economy humming, which helps support a robust rental market.

We (I work at Azibo, just a disclaimer) have quite robust accounting capabilities and time saving features like Schedule E generation and automated  transaction tagging rules.

@Brian Flanagan wow that is quite and impressive resume.

HE JUST CONSOLIDATED THEM ALL ALONG WITH HIS PDF CONTRACTS (WHICH ARE ALSO ALL OVER THE INTERNET) INTO ONE CENTRALIZED AREA... 5) He ADDED MORE OF THE SMALL NUGGET VIDEOS TAKING A SIMPLE PROCESS AND BREAKING IT DOWN LITTLE BY LITTLE (NOT SO MUCH FOR UNDERSTANDING PURPOSES) BUT MORE TO MAKE PROGRAM MORE ROBUST AND EVENTFUL 6) AND USED SIMPLE JSON CODING AND SQL (LIKE ZAPIER AND GLOBIFLOW) which can be done by using WordPress quite easily and created a lease option customer data entry base (CALLING IT THE LEASE OPTION THIS AND THE LEASE OPTION THAT DATABASE) It's basically the large packaged smoke and mirrors with a little touch of value and abundance simultaneously being thrown at you that will cause you to do one of two things (which is kind of the goal)  1) You get overwhelmed instead of focused and quit, or 2) you ignore all of his "upsells" and focus on the material you have and use what he gives you to the utmost extent...

But where I see click funnels being a challenge is a robust website with interlinking pages.