In specific condition to social economy entities might be included also typical for charity third sector associations and foundations.
A voluntary association or union (also sometimes called a voluntary organization, unincorporated association, common-interest association or just an association) is a group of individuals who enter into an agreement as volunteers to form a body (or organization) to accomplish a purpose. Common examples include trade associations, trade unions, learned societies and professional associations, environmental groups, and various other types of groups.
Membership is not necessarily voluntary, as it may be effectively required in order to work, which has led to a preference for the term common-interest association to describe groups which form out of a common interest.
A foundation (also a charitable foundation) is a legal categorization of nonprofit organizations that will typically either donate funds and support to other organizations, or provide the source of funding for its own charitable purposes.