Many local schools and school districts offer homework help for elementary students. Check with your local school for more information.

Many local public libraries offer free homework help for all elementary (and other grades) both at the library and many online. Requires library card. Do a Google search for free homework help libraries near me or something similar.

Also many states offer free homework help (you must be a resident) . Do a Google search for your state free homework help or something similar.

Be sure to check out Libraries for online libraries and Reference Desk for online dictionaries, encyclopedias, and other reference online information sites.

General: Here is a list of some of the best free online Homework help sites for junior high students (may include other grades)
Family Education.com - School and Learning - By Grade: Resources for improving reading, writing, studying, and note-taking skills for kids by grade.
HomeworkSpot: A gateway to relevant sites and resources for K-12 students needing homework help in most any subject area .
Internet Public Library - Kid's Space: Ask questions, find information & more.
Khan Academy: nonprofit with the mission to provide a free, world-class education for anyone, anywhere. Offers free practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom K-12 & college).
Kid Info.com: Free one website directory has Preschool and K-12 educational websites, videos, and PowerPoints.
Learn To Be: Free: 1-on-1, online tutoring, K-12.
Math and Reading Help: Provides articles on homework help for a variety of subjects, including math, reading, English and science, K-12.
School Family - Homework: Help your child get organized, improve study skills, and learn best from their homework for K - High School.
Wonderopolis: Nonprofit website that answers all sorts of questions submitted by children with fact-filled, kid-friendly articles and fun-to-watch videos, K-8, especially science and social studies.

Learning
childdevelopmentinfo.com - Learning: Provides information to assist parents in helping their children and teenagers to improve their learning and study skills. Techniques on how to develop motivation, attention, comprehension, organization and creativity are provided.
happychild.org.uk - Memory Improvement and Learning skills: Good website to help with learning and remembering in many different languages.

Math
Coolmath4kids: For 12 and under users, math, games, and more, designed to teach math and make it fun.
kidzone.com: Free printable math worksheets and games.
familyeducation.com - Math: Build you child's math skills, grades K-6.
themathpage.com - Skill in Arithmetic: A complete course in arithmetic.

Reading and Language Skills
starfall.com: Free website to teach children to read. For kindergarten, first grade, and second grade with interactive books and phonics games.