I got tired of this so I developed a software that uses call tracking numbers and I can create "blacklists" that block the numbers.  

If a PC or laptop is on site you can also have a piece of software do this for you.To combat this one option is just to buy a static IP.

I can purchase materials such as a copy of the landlord-tenant laws of our state that includes a summary to make them easy to reference; a list of tenants served with "unlawful detainer" (evictions) for my county that goes back seven years and is updated monthly; discount price landlording books; tenant education pamphlets for: Lead-based paint, Renovating Right, Mold & Moisture; property management forms/software.

Okay thank you for the insight just found some "Punch Home Design software" kinda a learning curve, but was just awesome for what I needed.

I don't use their services for rent payment, I only use their property management software.

As to PC, I'm not really certain, but you could probably find free floor plan design software in Google, though you may want to vet the site first.

Software engineer & web developer chiming in. 

There is pretty sweet software to look that up these days.

I have been spoiled by my access to ESRI's ArcGIS software.  

Is there any software / website out there which can analyze different neighborhood rents and costs (within a distance range), and return results?