There are tons of things you can learn online. From large amounts of tutorials on youtube to online university courses. Hereunder a selection of websites that offer full-fledged free online courses.
University of the People
The world's first non-profit, tuition- free, accredited online university dedicated to opening the gates to higher education for all individuals otherwise constrained.
Over 2,100 videos and 100 self-paced exercises and assessments covering everything from arithmetic to physics, finance, and history.
Cereal Knowledge Bank
The Cereal Knowledge Bank offers a number of E-learning courses in the area of development and growing cereals, especially rice, maize and wheat.
Open educational Resources from Cambridge University. Containes the Open Resource Bank for Interactive Teaching in Science and Maths (ORBIT), OER for schools, ASKAIDS on sexual reproduction and AIDS and a course in Zotero - to manage references.
The university of Berkely posts a lot of videos of courses on Youtube: chemistry, biology, cognitive science, computer science and much more.
Backpack Farm (BPF) actively educates and encourages environmentally intelligent farming: the fusion farming concept takes the best of synthetic chemical and bagged fertilizer products combining their application with superior organic products and holistic farming methods. Download their training manual:
Harvard open learning
offers some online courses on Chinese culture, shakespeare, algebra, computer science and more.
MIT Open Courseware
MIT published over 2000 courses in 33 academic disciplines. From Aeronautics, to chemistry, Biology, Earth Sciences to Women and Gender Studies.
Directory of Open Educational Resources from Commonwealth universities and educational institutions. Contains materials for higher education (>3000), Open schooling (>600), teacher education (>600) and technical and vocational skills development (TVSD) (>400).
If you want to learn languages, the following sites might be useful:
about learning languages:
Virtual Training Suite
Develop your internet research skills with these tutorials for 60 different academic disciplines.
All of the tutorials are written and reviewed by a national team of lecturers and librarians from universities across the UK.
a fun, light website where you can learn a lot. History, astrology, home improvement, ICT and more
Works towards improving the quality and quantity of teacher education in India and makes available learning materials in the categories science, maths, leadership, language & literacy and english. Materials are in English and Hindi.