Witch CRM for OnCarrot

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Sorry for the misspelling of "which". Can't figure out how to edit the title.

I love on carrot websites but I'm having a hard time figuring out which CRM to use with it. I like CRMs that are very specific to Realestate as they help me track leads from start to finish. Any suggestion. 

I have also heard of people using their email and Google Drive as a way to get organized. 

I'm open to any suggestions.