What's in your Tool Box?

[Jacob Benninger]

There are a lot of resources that talk about the basics of Real Estate and investing. However, I can't seem to find a lot of resources that talk about the tools available to us to make the process easier. Which leads me to ask this technology related question. 

Other than Bigger Pockets, What programs or Websites are out there to help a landlord with various aspects of the business. From acquisition to managing?