This is from the Public Domain Books for Homeschooling facebook page:

Charlotte Mason and CM-ish curriculum options. Many of these incorporate books that are available free in the public domain.

Charlotte Mason Curricula - when used as directed provides a generally authentic Charlotte Mason education.

CM Influenced Curricula - in and of itself does not provide a CM education, but incorporates some of Miss Mason's 20 Principles and sells itself as a CM Curriculum (generally speaking).

CM Adaptable Curricula - throw out the plans and busywork and use the booklists to implement an authentic CM Education.

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Charlotte Mason Curricula
www.amblesideonline.org
www.livingbookscurriculum.com $
www.simplycharlottemason.com $
www.charlottemasonhelp.com
www.materamabilis.org (Catholic)
milestonesacademy.com (LDS)
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CM Influenced Curricula
www.heartofdakota.com $
www.trainupachildpub.com (formerly Epi Kardia) $
www.winterpromise.com $
barefootmeandering.com/site/wayfarers (CM + Classical) $
amindinthelight.blogspot.com (CM + Classical)
www.mfwbooks.com (Neoclassical but leans CM in K-2) $
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CM Adaptable Curricula
www.oldfashionededucation.com
www.sonlight.com $
www.bookshark.com (secular) $
www.buildyourlibrary.com (secular)$
www.fiveinarow.com $
www.livingbooksforlife.com $ (K-5 Canadian)
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CM Subject Specific Resources (not Complete Curriculum)
www.queenhomeschool.com $
bfbooks.com (Beautiful Feet) $
www.jellybeanjar.org $
cherrydalepress.com (Languages) $
shiningdawnbooks.com $
handbookofnaturestudy.com
www.blessedheritage.com (African American History) $
barefootmeandering.com $
www.teachingwithbob.com (Reading/Phonics)
joyfulshepherdess.blogspot.com/…/all-my-charlotte-mason-rea…(Reading/Phonics)
homeschooljournal-bergblog.blogspot.com/…/simple-grammar-fr…(grammar)
www.pennygardener.com $
www.raceforheaven.com $ (Catholic)
www.homeschoolingdownunder.com $ (Australian Resources)
www.ohthatssimple.com/books.html $
cottagepress.net/ $ (Classical Liberal Arts)
wholesomechildhood.com/thetutor/ $
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CM Adaptable or CM Influenced Subject Specific Resources

Standard Math Instruction (preferred by Miss Mason)
http://www.cimt.plymouth.ac.uk/projects/mep (MEP Math)
miquonmath.com $
Math Mammoth $
Right Start Math $
Math-U-See $

Living Math Instruction (Not preferred by Miss Mason)
www.ztwistbooks.com/lof $ (Life of Fred)
livingmath.net

Science
www.apologia.com $
sassafrasscience.com $
logospressonline.com/noeo $
slphomeschool.wordpress.com $ (Glory of Kings)

Arts
harmonyfinearts.com $
www.riverbendpress.com $
remembrancepressbookstore.com $ (sketching and homemaking)
enrichmentstudies.com $

History
www.truthquesthistory.com $
www.nothingnewpress.com/books $
www.home-school-curriculum.com/learning_series $ (Trail Guide to Learning)
harmonyfinearts.com
ureadthru.wordpress.com (claims to be CM but is really just living books with busy work)

Geography
A Child's Geography $
www.knowledgequestmaps.com $ (Map Trek)
http://home-school-curriculum.com/ $ (Geography Matters)

General Resources
https://www.facebook.com/groups/PublicDomainBooksForHomeschooling

(Picture: The Homework by Simon Glücklich)