Best Real Estate CRM Software for Lead Generation & Scalable Data Management?

[krayin_crm]

I’m evaluating options for a Real Estate CRM Software that’s robust enough to handle high-volume lead intake, automate follow-ups, and offer strong data structuring for listings and client records.
I’m specifically looking for:

• A Property CRM Software that supports custom fields (property types, budgets, location tags, etc.)
• Automated lead capture from real estate portals and social media ads
• Smart follow-ups via email/SMS based on user behavior or lead status
• API support for integration with MLS systems or external property databases
• A self-hosted or open-source option would be ideal for long-term control

Has anyone here worked with an open-source Real Estate CRM for Realtors like Krayin CRM or something similar? I’d love to know how customizable it is, and how well it scales with a growing contact and property database.
Appreciate any real-world insights or stack recommendations!