If you're looking for generic features, lots of choices.

Originally posted by @Trellis Alexander:@Abel Curiel thank you so much.Anytime, happy to help.With regards to your previous question, I strongly recommend taking advantage of BiggerPockets' 'search' feature.

There are some that charge monthly members, which is a benefit if you're going to maximize all their features and values. 

I've lived in and visited a bunch of places, but western PA has some unique physical and historical features that lead to the SFR characteristics you describe.The chief one is that there is a disproportionate number of 1890-1929 SFR builds of exceptional, lasting quality out here. 

I like the search features: https://www.biggerpockets.com/searchAlerts can be really helpful too: http://www.biggerpockets.com/alertsThere are a few self-contained guides that you can access here: https://www.biggerpockets.com/guides

@Harold Albertson, I agree with @Nathan G.that you should provide us what you're needing/wanting the most from your software.On the professional-level (Buildium/Appfolio), there are a ton of features and more accounting functions built in. 

As you get more business you could create more features, starting from the ground up with a minimum viable product.

All three have on line free search features.

I don'tusethe other features they offer (application, maintenance requests,document sharing, listing syndication).

But it depends on what features you're searching for.