I've been testing CRMs for several months now. I stumbled upon Cosmos CRM recently. A banner on the site proclaims that for a limited time, they are offering their services for free. I signed up and began testing things out. What I found is a system that seemed very promising, but it appears that the creators have abandoned it. No response to emails, their Facebook page hasn't been updated since last year. It's too bad, because they really could have had something.
Very simple design--looks nice and is very easy to figure out. Doesn't have a lot of extras (which is what I prefer). Price can't be beat (free).
No support whatsover. It looks like the developers abandoned this project but forgot to take down the website. Or, they collectively got hit by a bus. Doesn't seem to be any native integrations either.