Spelling and Vocabulary Curriculum

Spelling
Time4Learning Spelling Lists (click the list on the left for free lists, PreK-8)
K12Reader Spelling (1-5)
Bible Based Spelling (Lower Elementary)
Spelling City (Beginning Spellers)
Spell by Color (grade 3+)
TLSBooks Spelling Worksheets (Elementary)
Spelling Connections Spelling Practice Books (1-8)
AAASpell (1-8)
The Basic Cozy Spelling Course (6-8)
Home Spelling Words (K-8)
KidsSpell (1-12)
McGuffey's New Progressive Spelling Book (K-12)
McGuffey's Eclectic Spelling Book (K-12)
Easy Steps in Spelling (K-2)
Hazen's Complete Speller (K-12)
Pollard's Synthetic Speller (K-2)
Pollard's Advanced Speller (Grades 3+)
Spelling Books (K-12)
Wheeler's Elementary Speller
Wheeler's Graded Studies in Great Authors:  A Complete Speller
McGraw-Hill Treasures Spelling Workbooks (K-6)

Vocabulary
Wordly Wise 3000 (2-12)

Grammar and Composition

Wheeler's Graded Studies in English
Wheeler's Graded Studies in English: First Lessons in Grammar and Composition

Harvey's Grammar Series
Harvey's Elementary Grammar and Composition (4-6)
Harvey's Practical Grammar (7-8)
Key to Harvey's Practical Grammar

Maxwell's English Series
Primary Lessons in Language and Composition (1-4)
First Book in English (3-5)
Introductory Lessons in English Grammar (5-8)
Maxwell's School Composition (5-8)
Advanced Lessons in English Grammar (Middle-High School)
Writing in English (Middle-High School)

Progressive Composition Series
Progressive Composition Lessons Book 1 (3-4)
Progressive Composition Lessons Book 2 (5-6)
Progressive Composition Lessons Book 3 (7-8)

Fleming's English Series
A Child's Composition Book (4-6)
A Composition-Grammar (7-8)
Practical English for High Schools (High School)

Dalgleish's English Series
Outlines of English Grammar and Analysis for Elementary Schools (Elementary)
The Progressive English Grammar
Grammatical Analysis
Introductory Text-Book of English Composition (High School)

Grammar
KISS Grammar (2-11)
Weld's Progressive English Grammar (All Grades)
McGraw-Hill Treasures Workbooks (K-6)  **Added 7/20/13

Composition
Elementary English Composition for High Schools and Academies (High School)
Purdue OWL English (7-12)

Grammar and Composition
Scott Foresman Online Grammar and Writing Handbooks (1-6)  **Added 7/19/13

Complete Curriculum Options

Preschool
Brightly Beaming Resources (PreK-Early Elementary)
First School Preschool (thematic units, Pre-K-K)
Read to Me and ABC (PreK) **Added 7/24/13

Charlotte Mason
Ambleside Online (K-12)
Mater Amabilis (Catholic, K-8)
Higher Up and Further In (AO-inspired, K-12)
Tanglewood School (1-8)
Simply Charlotte Mason Curriculum Guide (K-12)
Milestones Academy (K-10)

Classical
The Classical Curriculum (PreK-12)
Classical Homeschooling (K-12)

Primarily Public Domain Text-based
An Old-Fashioned Education (K-12)
Your Free Homeschool Library (K-12) - While I do not provide a schedule or specific book recommendations, I have gathered a plethora of vintage textbooks and categorized them by grade and subject, making it simple for a teaching parent to choose what they need to teach most of the core subjects.

Primarily Web-Based
Lesson Pathways (K-5)
Easy Peasy All-in-One Homeschool (K-High School)
EZSchool (K-12)
DiscoveryK12 (K-12) *Added 9/6/16*
HippoCampus (covers math, science, social studies, and religion, Middle-High School)
Connexions (High School-Adult)

Flashcard/Worksheet-Based
Free World U (K-12)
Head of the Class (K-5) *Update 7/5/13* This site appears to be closed, but I will leave here in case it returns.

Core Knoweldge-Based
Baltimore Curriculum Project Core Knowledge Lessons (K-5)

Single Year Unit Study
Teaching with God's Heart for the World (Elementary)

School Curriculum Guide
Hillsdale Academy Curriculum  (requires free registration, K-12)
Liberty Academy Online Curriculum Guides (scope and sequence, 3-12)

Reformed
Puritan's Home School Curriculum (K-12)

Memory Work

Chants, Jingles, and Songs
Association of Classical & Christian Schools List

Memory Work Resources
Circle Time and Memory Work

Reading Lists

Need ideas for what to read this year?  Try these booklists!
Mensa Excellence in Reading Award Program (K-12)
Houston Area Independent Schools Library Network Recommended Reading Lists (PreK-12)
Generation Joshua Recommended Reading (High School)
Robinson Curriculum Online Books (1-12)
Read.gov Booklists (Kids-Teens)
ALA 2013 Notable Children's Books (K-8)
Caldecott Medal & Honor Books, 1938-Present (Picture Books)
Geisel Award Winners & Honor Books, 2006-Present (Beginning Readers)
Newbery Medal and Honor Books, 1922-Present (Children's Literature)
ALA Great Early Elementary Reads (Early Elementary)
Hi-Lo Books for Upper Elementary (Reluctant Readers 3-6)
Flashlight Worthy Books  (user-contributed book recommendations, all ages)
About.com Children's Books  (many book lists, all levels)
California Reading List (K-12)
Accelerated Reader Book Finder (K-12)
A Classical Christian School's Reading List (1-3) **Added 7/21/13
A Classical Christian School's Reading List (4-5) **Added 7/21/13
A Classical Christian School's Reading List (6-8) **Added 7/21/13

Curriculum providers who make their reading lists available online:
Sonlight (PreK-12)
Veritas Press (K-12)
Tapestry of Grace Bookshelf Central (K-12)
Living Books Curriculum (K-High School)
Great Books Academy (K-12)
Robinson Curriculum Book List Sorted by Reading Level (1-12)

Science Booklists
Outstanding Science Trade Books for Students K-12
Science Trade Books by Topic
Readable Science

Math Booklists
The Mathematics Bookshelf
Children's Trade Books in Math

Social Studies Booklists
Notable Tradebooks for Young People

Summer Reading Lists

Summer Reading Bingo (1-6)
Summer Reading List 2013 (K-6)
Legacy Traditional School Summer Reading List (K-8)

Literacy Resources

Reading
Reading Rockets

All Subjects - Teaching Resources

Worksheets and Lesson Plans
Some links may lead to sites containing both paid and free content.
Laura Chandler's File Cabinet (3-6)
Teacher Created Resources (Elementary)
The Teacher's Corner (Elementary)
Teach-nology
Learner.org

Interactives
Interactives
K-2 Interactives
3-6 Interactives
7-12 Interactives

Games
FunBrain for Teachers
Primary Games Curriculum Guide (Primary)

Your Free Virtual Home Library

Children's eBooks
International Children's Digital Library
The Baldwin Online Children's Literature Project

Aesop Fables
Aesop's Fables

All Ages eBooks
Some titles may not be appropriate for children.
Books Should Be Free
Project Gutenberg
Kellscraft Studio's Web Text-ures
ManyBooks.net
e-BooksDirectory.com
Full Text Archive
2020ok

All Ages Audiobooks
Some titles may not be appropriate for children.
Internet Archive Audiobooks
Librivox
Arlington Public Library Audio Book Cloud
Audio Books for Free
Audiobooks Treasury
MacBeth's Audio Opinion
AmblingBooks (audio bookstore, requires registration, offers certain titles free)

Blogs
Homeschooler's Guide to Free Kindle Books (Links to many free Kindle books for homeschool use)

Ebook Reader Apps
Free Kindle Reading Apps

Reading Comprehension

FreeReading Comprehension (K-3)
ReadWorks (K-6)
Have Fun Teaching (K-8)
RHLSchool Reading Comprehension (Upper Elementary-Middle School)
English for Everyone Reading Comprehension (K-12)
ReadTheory (K-12 - UK Levels 1-13)