Here is a list of some NGOs and association that are looking for volunteer translators or interpreters:

Ashoka: Nonprofit organization supporting the field of social entrepreneurship.

Babels: Babels is an international network of volunteer interpreters and translators whose main objective is to cover the interpreting needs of the Social Forums.

Cafe Babel – The European magazine: (French, Spanish, Italian, Polish, English, Catalan, German)

FranceGenWeb: Volunteer translation of genealogical documents into French

Free Software Foundation Europe: Free Software Foundation Europe is a non-profit organisation dedicated to the furthering of Free Software, and works to promote freedom in emerging digital society.

Global Voices: Global Voices is a community of more than 500 bloggers and translators around the world who work together to bring you reports from blogs and citizen media everywhere, with emphasis on voices that are not ordinarily heard in international mainstream media.

Kiva: Kiva is a non-profit organization with a mission to connect people through lending to alleviate poverty.

Human Rights Education Associates: An international non-governmental organisation that supports human rights learning.

ICVolunteers: ICVolunteers is an international non-profit organization specialized in the field of communication.

Translators without borders: Not-for-profit association providing free translations to humanitarian organizations.

UN Online Volunteering Service: The Online Volunteering service is one of the United Nations Volunteers (UNV) programme’s corporate tools to mobilize volunteers for development. It connects volunteers with organizations working for sustainable human development. More.

See: Languages and Translation