Where can I find good and free course material for undergraduate sciences {phy, chem, math ) on the net?
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The MIT OpenCourseWare Project publishes lecture notes, exams, reading assignments, etc. for nearly all of the "core" courses taught at MIT.  From their website (see source): "[the OpenCourseWare Projects is] a free and open educational resource for faculty, students, and self-learners around the world."\n\nIn addition, a lot of faculty members from numerous institutions now make their lecture notes available on the Web.  Simply do a web search for the topic you are interested in, and you'll come up with quite a few hits.
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www.chemistry.arizona.com\nwww.wikipediaencyclopedia.co\nhttp://www.echemistryhelp.com/\nhttp://chemfinder.cambridgesoft.com/\nhttp://www.chemguide.co.uk/\n This are some of the website
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Consider ordering a Chemistry magazine from your local University or nearby University. ChemCorner usually has lots of information about current research etc.
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I kindly suggest you go limewire.com and download the software and install then search with sensible keywords and get what you want. I have found lots of molecular biology, biotechnology, neurology, immunology etc. e-books as well as some "nature" papers as well. I do not think any site that  publishes science e-books( well, any comprehensive e-books) without a significant charge for it exist. \nTake care
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http://www.pageresource.com/\nhttp://www.w3schools.com/default.asp\nhttp://www.webpasties.com/?source=xmlhttp\nhttp://jessey.net/\nhttp://www.htmlgoodies.com/\nhttp://www.echoecho.com/school.htm
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www.Demonoid.com\nwww.Yahoo.com\nwww.Google.com\nwww.Learner.org\nwww.ThePirateBay.org\n\nwww.Wikipedia.org\nwww.Britannica.com\nwww.YouTube.com\n\nwww.Orkut.com\nwww.hi5.com\nwww.eBay.com\n\nwww.Amazon.com\nTutorial.math.lamar.edu
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http://www.livescience.com/ \n\nhttp://www.sciencedaily.com/\n\nhttp://www.sciam.com/\n\nhttp://www.scitechdaily.com/\n\nhttp://www.eurekalert.org/
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I have not seen any free stuff. Most material seems to be $50 or  more. If you live in a major city you might find something at the library.
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teachnet.com\ninternet4classrooms.com\nsuelebeau.com\nin2edu.com
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http://scienceworld.wolfram.com/
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Try this directory:\n\nhttp://matematicas.udea.edu.co/~carlopez/\n\nIt has everything about Chemistry (Is really big) but it has a classification about the chemical branches.
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http://chemfinder.cambridgesoft.com/
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http://www.reachoutmichigan.org/funexperiment/agesubject/subject.html.\nThis website focuses on the following areas: Astronomy, Biology, Physical Science, Technology, Chemistry, and Earth Sciences. \n\nhttp://www.enc.org/features/lessonplans/?ls=fe\nThis provides a list of science and math lesson plan sites, categorized by topic.\n\nhttp://www.education.noaa.gov/\nOn this website, you can access many educational activities, publications and booklets on the following topics: Satellites and space, oceans and coasts, climate change and our planet, and weather.\n\nhttp://mapping.usgs.gov/www/html/1educate.html#packets\nOn this website you can find interesting and useful teaching packets, fact sheets, posters, booklets, leaflets, and brochures about geography and related sciences.  Resources are available through the Earth Science Information Center at 1-888-ASK-USGS (275-8747).\n\nhttp://www.nws.noaa.gov/om/edures.htm\nThis site offers information for children, teens, and young adults.  Materials range from coloring books, puzzles and games, to lesson plans, brochures, satellite images, and career information for weather related fields, such as meteorology, hydrology and climatology.\n\nhttp://school.discovery.com/\nThis site offers an array of tools to help create your own materials.  The site can be used in teaching elementary, middle, and high school students.\n\nhttp://teacherlink.ed.usu.edu/\nOn this website, you will find free teacher resources such as units, lesson plans, worksheets, posters, lithographs, collaboration opportunities, activity kits, and much more, which NASA provides to public teachers.  \n\nhttp://www.tufts.edu/as/wright_center/svl/posters/posts.html\nThis web page will provide you with information on how you can get free science posters.\n\nhttp://www.usgs.gov/education/\nOn this web page, you can get a variety of teaching packets, booklets, posters, lesson plans, activities, fact sheets, and even bookmarks on the subjects of geology, biology, geography, and hydrology.  The grade level for this information is kindergarten to twelfth grades.\n\nhttp://www.vims.edu/bridge\nThis is a site where teachers will find a selection of online resources for ocean sciences education.  This site provides educators with content-correct marine information and data.\n\nhttp://www.pbskids.org\nThis website has different categories: Entertainment, playroom, reading, science, social studies, and study resources.  It also includes helpful information for parents.\n\nhttp://www.discovery.com/\nThe Discovery Channel\n\nhttp://www.nasa.gov/\nNASA’s web page\n\nhttp://www.redcross.org/\nThe web page for the American Red Cross
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Have you tried www.teachit.co.uk? Or try the DFE webby.
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I attached a link in sources that has a huge list of all legitimate online classes and universities. There is an extremely large section for computer programming.
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http://highschoolace.com/ace/science.cfm\n\nnot sure exactly what you need but highschool ace always gives me good resources
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http://highschool.lib.ua.edu/sci.html