Also look back on their application and see if you missed any 'red flags" so this can be a valuable learning experience for you.

Appraiser's learned a valuable lesson in 2008 when they were accused of being one of the causes of the great recession.

This tool (no affiliation with BiggerPockets) can help your son find properties with assumable loans. 

.: I'd like to know if hosts are using the dynamic pricing tool on Airbnb and VRBO.  

Not sure if that is still legal or even translates in today's world of everything online but seemed like a good screening tool to me at the time. 

@Nichole StohlerI find using a SDIRA to be a great tool for passive investments and growing your retirement with less stress than the stock market roller coaster. 

Build a strong team, including agents, lenders, and property managers, and use tools like the BiggerPockets calculator to analyze deals.

is there a tool on this site? 

I've had a long career in community development and have a lot of bank contacts that would likely be interested in investing, but I'd need to prove the concept first with an initial fund (there are also a lot of other community development tools that could be leveraged to maximize and scale this).

Quote from @Tod DuBois: Looks like everyone is using some software tools for various tasks, I'd not heard of most of them.