This makes it the most popular CRM project on SourceForge, company officials claimed.
Despite those millions of downloads, SugarCRM (the company) only claims 80,000 organisations are using the Community Edition, with an unspecified number using a commercial edition.
An advantage of SugarCRM is that organisations can modify the program to meet their exact needs.
Australia's InsightfulCRM is one of the members of SugarCRM's Open+ partner program.
"We're seeing SugarCRM CE generate a lot of awareness amongst IT professionals, which often leads to positive referrals to decision-makers in the business," said director of consulting Marc Englaro.
"For many businesses, SugarCRM's freemium model often serves as a stepping stone to its commercial product suite.
"Because of SugarCRM's open source roots, we can easily adjust code and create integrations to meet very specific customer needs."