Textbooks+free+online

Textbooks free online through a variety of sources. Check if they meet your instructional goals or even professional goals, as some are college level..

= ** Free Textbooks ** =
 * __Blog Books__ ** has some links to free online textbooks. A couple were only samples, but the rest were full textbooks for free. Download and viewing options vary as these are links offsite.
 * __Bookboon__ ** has a huge collection of free textbooks in a wide variety of subjects. All are available for free download in PDF.
 * __CK12__ ** has a large collection of free textbooks in a 21 different subjects and SAT prep . All are available for free download in PDF, MOBI or EPUB, after free registration. The PDFs load immediately. The MOBI abd EPUB are generated and a download link is emailed to you.
 * __Curriki__ ** has a large amount of textbooks and other educational resources, but it is hard to navigate around. Free registration with valid email for confirmation is required. Ranges from Kindergarden to College level. Mostly written materials, with some audio and video.
 * __Digital History__ ** a complete history of the USA available for free reading online without registration.
 * __Free eTextbooks Online__ ** has a large collection of links to free texttbooks online in a good number of subjects. Links are offsite so download and viewing options vary.
 * __FreeTechBooks__ ** has links to a good collection of free math and computer related textbooks. Download and viewing options vary as these are links offsite.
 * __InterActMath__ ** offers about 60 free mathematics textbooks for free online use. Press the enter button up top, the links across the bottom are for their pay sites.
 * __MecMath__ ** offers the free textbooks, //Vector Calculus// and //Trigonometry//, for free download in PDF without registration. Designed for college students, but also useful for high school education.
 * __Merlot__ ** a huge collection of free learning resources in a wide variety of disciplines. The links are offsite, so download and viewing options vary.
 * __Open Culture__ ** has links to 160 free textbooks online in 19 different subjects. Download and viewing options vary as these are links to a variety of sites.
 * __OpenStax College__ ** has only a few textbooks, but they appear to be high quality. All are availalble for free reading online or free download in PDF or EPUB.
 * __RobBeezerPhD__ ** offers his textbook, A First course in Linear Algebra, for free reading online and free download in PDF. There are also links to ** __other free online math texts__ **(download and viewing options vary).
 * __Saylor.org__ ** has a wide variety of courses and textbooks available for free. All the ones checked were offered for free download in PDF, but download and viewing options may vary as these are links offsite.
 * __Siyavula__ ** free textbooks in math and science for grades 10 to 12 available for free reading online and free download in PDF without registration. . Also natural science and technology texts for Grades 4 - 6 all in free PDF without registration.
 * __Stitz-Zeager__ ** offers a free Pre-Calculus textbook for free download in PDF without registration.
 * __Synechism__ ** offers 4 free math related textbooks for free download in PDF without registration.
 * __Textbook Revolution__ ** is a student run website that has links to a wide variety of free textbooks and course materials online. Download and viewing options vary as these are links offsite.
 * __The Orange Grove__ ** provides free textbooks as part of the State of Florida's (USA) portal of free educational resources. All the ones that I looked at were available for free reading online and free download in PDF without registration.