All of those CRMs are generic CRMs. This Real Estate CRM is built only for Real estate agents and agencies. It has features required for the Real Estate business.
Such as?
Just some unsolicited feedback - I can't tell from anywhere on your landing page what this actually does differently for Real Estate businesses vs any old generic CRM.
A lot of superlatives and efficiency promises, but no details about why I, as a Real Estate professional, should choose this specifically.
In particular, the big header of "Find a CRM specifically designed to meet the requirements of real estate professionals" is followed by 4 "features" that have nothing to do with real estate (Unlimited Free, No User Limit, No License Fees, Open Source). I would put your real estate specific features here.
It's also a little confusing that the landing page header appears to be for a web development company?