High School Ace is a large Web site that offers information about English, math, science, history, foreign languages, health, colleges, and politics and current events — as well as games, puzzles and hobbies.
Junior Achievement: dedicated to educating students about workforce readiness, entrepreneurship and financial literacy through experiential, hands-on programs.
Roots & Shoots engages and inspires youth through community service and service learning.
Science Niche offers many different resources, guides, and even experiments for high school and college students.
Spelling Bee Hive: Merriam-Webster (the dictionary people) offer a variety of language resources in support of the Scripps National Spelling Bee. (The Spelling Bee’s only official resource for spelling and pronunciation is Webster’s Third New International Dictionary, Unabridged.)