100% FREE FOR LANDLORDS. (SERIOUSLY.)

Turbo tenant was just launched this week! It is a 100% free for landlords software. Turbo tenant can help you fill your units quickly, screen tenants, and save you money by making the process very easy. This software can be good from person who owns one unit to the big guy with hundreds.
They also have a blog that will give you helpful pointers and tips. The newest one is about social media and marketing. It’s a great read.