Mission-based organization is often used as an alternative to terms such as non-profit and non-governmental organization.
Mission-based organizations range from formally incorporated

Incorporation (business)

Incorporation is the forming of a new corporation . The corporation may be a business, a non-profit organisation, sports club, or a government of a new city or town...

 foundations

Foundation (charity)

A 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....

 and philanthropic

Philanthropy

Philanthropy etymologically means "the love of humanity"—love in the sense of caring for, nourishing, developing, or enhancing; humanity in the sense of "what it is to be human," or "human potential." In modern practical terms, it is "private initiatives for public good, focusing on quality of...

 agencies to informal neighborhood groups that undertake an ad hoc

Ad hoc

Ad hoc is a Latin phrase meaning "for this". It generally signifies a solution designed for a specific problem or task, non-generalizable, and not intended to be able to be adapted to other purposes. Compare A priori....

 project.

They may be faith-based

Faith-based

The term faith-based is a neologism , mostly current in US English, to describe any organization or government idea or plan based on religious beliefs, specifically Christian beliefs....

organizations, or secular organizations assisting in neighborhood welfare or improvement.