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Publishers: Free High School Texts, California Learning Resource Network, CK12 Foundation,  
21st Century Learning Products, Connexions and UC College Prep Open Access

Mathematics
Test-Prep Mathematics reviews Pre Algebra, GED mathematics
Mathematics Review 9 two-page reviews of Test-Prep Mathematics.
Grade 10 Mathematics-FHSST

Grade 11 Mathematics--FHSST

Grade 12 Mathematics--FHSST

Middle School Math-Grade 6--CK12

Calculus--CK12 
Calculus--CLRN DTI3
Cálculo General
Calculus AB, AP
Calculus BC, AP

Special Math Sites
Mathematics Internet Library
Math, Interactive, where you learn math by playing with it.

Science
8th Grade Science from Wikebooks
Wikijunior Solar System from Wikijunior

Grade 12 Physical Science-FHSST
Earth Science (Grades 6-9)
Earth Systems, an Earth Science Course (Grades 9-10)

Earth Science-HS-- CK12

Earth Science HS- - CA DTI 3
Environmental Science, AP

Biology-- CK12

Biology I--CK12

Biology I Workbook--CK12
Biology I - -Honors DT3 --CLRN
Biology
Biology, AP

Chemistry Grade 10 [CAPS] Chemistry Workbook--CK12

Chemistry Engineering: An Introduction for High School--CK12
Concept Development Studies in Chemistry-- Connexions