Sergey
This is the best and most flexible…
This is the best and most flexible solution with nothing extra. I recommend. The disadvantage is the high cost of additional packages.

EspoCRM is a open source web application that allows users to see, enter and evaluate all your company relationships regardless of the type. People, companies, projects or opportunities — all in an easy and intuitive interface.
EspoCRM (espocrm.com) has 23 customer reviews on Five Star Index, with an average rating of 4.6 out of 5.
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Sergey
This is the best and most flexible solution with nothing extra. I recommend. The disadvantage is the high cost of additional packages.
Randolph T.
EspoCRM is a great self-hosted CRM that can be as simple as needed and scalable to serve large corporations of any size. Highly recommended and very cost-effective alternative to so many over-priced CRM solutions like Salesforce.
Stefan
Great App Builder (not only CRM), well thought and always finding surprising gems. Busy Community always with a helping hand. That makes EspoCRM best choice even for non IT specialists.
Eblasoft L.
More & more than just a CRM, it is a powerful full featured and ready to use platform.
Hans D.
EspoCRM delivers a good product that is highly customizable. I did add some extensions to the product for our specific purpose and that's a good strength of EspoCRM. I was glad I could do this. Also support at github is quick and professional.
Orit S.
I really like EspoCRM. It's like EspoCRM programmers Get into my mind and build what I need especially for me! I am using downloadable open source, in my web hosting, from February 2017. And I am very pleased!
Joel D.
Very great and flexible CRM System. Easy to use.