COSS has around a hundred members from open source service providers and retailers from both public and private organizations deploying open source solutions and innovation models. Since 2014, it has been possible for private person to join COSS as a supporting member.

COSS provides its members with high-quality business and competence development services and represents a growing business community. COSS, for example publishes news related to the member organizations, give free consultation on licensing matters or a free, or a cut-price, admission to several events throughout the year.

Our members are at the heart of openness creating change.

The membership fee depends on the number of personnel in the member organization.