Rod and Staff Publishers 
Publishers of Bible-based text-books useful for home schoolers and others wishing to establish a "plain" school with a Bible-based curriculum. Also publishes other books and tracts.
http://anabaptists.org/ras/Lamp and Light Publishers 
Producers of many tracts, Bible studies, correspondence courses, booklets and Sunday School materials. In English and Spanish mostly, but also some in French. Online sign-up form for free correspondence courses.
http://www.anabaptists.org/places/lnl.html
Biblical Viewpoints Publications 
Theology and Biblical study books, including major Mennonite theology books.
http://www.bibleviews.com/Books.html
Publicadora La Merced 
Publishing outfit in Costa Rica. They offer tracts as well as a bi-monthly magazine titled "La Antorcha de la Verdad." They are working on Christian school curricula in Spanish.
http://www.anabaptists.org/places/plm.html
Mennonite Publishing House 
Owned and operated by the Mennonite Church, the house publishes books, periodicals and curricula under the name Herald Press.
http://www.mph.org/
Cascadia Publishing House 
Releases books for Anabaptist, Mennonite, and general readers.
http://www.pandorapressus.com/
The Plough Publishing House 
Publishing division of the Bruderhof communities.
http://www.plough.com
Christian Light Publications 
Major conservative Mennonite publishing company in Harrisonburg, Virginia. Producers of the widely-used Christian Light Education curricula. Publish many books for families. Site offers a service for locating conservative Mennonite congregations.
http://www.clp.org/