Highrise CRM is a customer relationship management solution created by 37Signals, more known for their project management product Basecamp. After the company made the announcement that Highrise CRM will no longer be developed, a lot of people started to look for solutions that could replace it. Bitrix24, which combines features of Highrise, Basecamp and Campfire, is a great free Highrise CRM alternative.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.