I use Friday CRM. Before working with this system, I had great expectations, they came true. When I visited the site https://fridaycrm.com/blog/free-online-contact-management/ it turned out that they had a free period. The items with the settings are clear, but there are a lot of them, I had to figure it out. Integrated CRM with the site. During this process, he contacted support several times. Now everything is configured and working fine.