I've seen and used dozens of CRMs. This one may change the market upside down. Absolutely great, easy-to-use and powerful.
AgileCRM is the coolest, easiest and by far the most productive CRM I've ever used. Within 20 minutes we had customized the CRM, sent out a complex outbound email campaign and are already converting our leads. Insane!
Agile CRM is an exciting and powerful system. The capability to create complex workflows to customize our interaction with prospects is immensely useful and easy - simply a matter of drag and drop.
We like Agile CRM because it's built for a combination of offline/online business, like a SaaS company that manages enterprise deals. It's full of features, but doesn't feel cluttered as they keep things clean and simple. And we love that they keep adding integrations.