Maximizer is a long-standing CRM product that was created over 20 years ago. Use this CRM if you are looking for a simple, well laid out CRM that is easy to understand. It integrates well with email clients and calendars.
Maximizer is available both online (Maximizer Live) or on your own servers (Maximizer On-premise). Both products have the same look and feel, and client computers require no installation (apart from email integration).
Maximizer’s Datacentre is in the USA.
See https://www.maximizer.com/ for details.