Schools and Universities

Coursera : Higher education that overcomes the boundaries of geography, time and money.

Udacity : Learn. Think. Do. Free Online Classes in Programming, Computer Science, Math, Sciences and Entrepreneurship from Top University and Industry Instructors.

edX : Explore free courses from edX universities. MITx. HarvardX. edX and Massachusetts Community Colleges join in Gates-Funded educational initiative.

Khan Academy : A library of over 3000 videos covering everything from arithmetic to physics, finance, and history and hundreds of skills to practice.

Growth Supply : +400 Awesome Free Tools To Build Your Business.

Academic Earth : Offering free online classes, Academic Earth provides online learning success. Their courses online feature university lectures making education online simple.

Youtube EDU : YouTube EDU brings learners and educators together in a global video classroom. On YouTube EDU, you have access to a broad set of educational videos that range from academic lectures to inspirational speeches and everything in between.

MIT Open Course Ware : Free MIT courses, including videos, audio, simulations, lecture notes, and exams.

Open Yale Courses : Open Yale Courses provides free and open access to a selection of introductory courses taught by distinguished teachers and scholars at Yale University.

Open Culture : Free online courses from the world’s leading universities. Download 550 free courses from Stanford, Yale, MIT, Harvard & Berkeley to your computer or mp3 player.

Stanford Online : Stanford Online provides free and open access to a selection of introductory courses taught at Stanford University.

Iversity : MOOCs (Massive Open Online Course) from Germany.

University of Reddit : Courses from Music to Philosophy taught by Redditors.

Webcast Berkeley : Webcast Berkeley is the campus service for recording and publishing course and campus events for students and learners around the globe.

Cosmo Learning : A free educational website for students and teachers.

Lecture Fox : Lectures online on computer science, mathematics, physics and more.

Patrick JMT : Making free and hopefully useful math videos for the world.

Learners TV : Video lectures on physics,biology,chemistry,maths,computer science,engineering,medical,dentistry,accounting and management,literature,law, economics, etc.

University of the People : A tuition free online university dedicated to the global advancement and democratization of higher education.

MOOC Francophone : Portail francophone de MOOC.

OCEAN : Un portail destiné aux cours en ligne ouverts à tous, en langue française.

General Sites

Wolfram Alpha : Wolfram|Alpha is more than a search engine. It gives you access to the world’s facts and data and calculates answers across a range of topics.

Erowid : Erowid is an online library containing tens of thousands of pages of information about psychoactive drugs, plants and chemicals.

Big History Project : Big History examines our past, explains our present, and imagines our future

Assembly : Turn ideas into great products with people around the world.

Edge : Promotes inquiry into and discussion of intellectual, philosophical, artistic, and literary issues, and works for the intellectual and social achievement of society.

Stanford Encyclopedia of Philosophy

Big Think : A knowledge forum featuring the ideas, lessons, stories and advice of leading experts from around the world.

ConstituteProject : The World’s constitutions to read, search and compare.

Socratic : Get smarter together. Questions and answers that actually help you learn

Financial Investing Tutorials : An index of tutorials that Investopedia has created covering Active Trading, Forex, Personal Finance, Investing and more.

Scitable : Free eBooks and hundreds of articles covering cell biology, genetics evolution, gene expression, and the rich complexity of cellular processes shared by living organisms.

Mind Tools : Mind Tools teaches more than 700 skills that help you excel at work and in your life.

Management Help : A comprehensive resources regarding the leadership and management of yourself, other individuals and groups.

DNA from the Beginning : Discover the concepts and experiments that define the fields of genetics and molecular biology. This animated primer features the work of over 100 scientists.

Internet Archive : Internet Archive is a digital library offering free universal access to books, movies & music, as well as 150 billion archived web pages.

Understanding Science : Resources for K-16 teachers about what science is and how it works.

Especes : Espèces est une revue de vulgarisation scientifique entièrement consacrée aux sciences naturelles.

Academic Journals

Scholar Google : Provides a search of scholarly literature across many disciplines and sources, including theses, books, abstracts and articles.

ResearchGate : Share and discover research.

Arxiv : An Open Archives Initiative (OAI) compliant archive of electronic preprints in physics, mathematics, computer science, and non-linear sciences.

Digital Commons Network : Open access academic research from top universities.

Doaj : Categorized, searchable links to free, full text, quality controlled scientific and scholarly journals.

Scribd : A digital documents library that allows users to publish, discover and discuss original writings and documents in various languages.

Persee : Portail de revues en sciences humaines et sociales.

Wikiversity : Wikiversity is a Wikimedia Foundation project devoted to learning resources, learning projects, and research for use in all levels, types, and styles of education

Specific

Music Theory :

Train Ear : Use this free online ear trainer and learn how to play songs by ear.

Music Theory: Includes introductory and intermediate music theory lessons, ear trainers, and books.

IMSLP : A community-built library of public domain sheet music. Extensive collection of original scores scanned to PDF.

Guitar :

Justin Guitar : Completely free guitar lessons from Justin Sandercoe.

The Stringery : Lessons, guitar videos, articles, reviews, tabs, printables, diy guitar projects, and more.

Next Level Guitar : Online guitar lessons covering electric and acoustic guitar. Learn to play guitar online with our structured learning to play guitar system.

Chord Book : Provides interactive tools for guitarists to learn chords scales in a audio visual environment.

Johannes Hoff : Help memorize the notes on the guitar neck

Jazz Guitar : Learn how to play jazz guitar : free online guitar lessons, tabs, chords, licks, mp3 & online guitar tuner.

Songsterr : Guitar, bass and drum tabs with free online player. One accurate tab per song. Huge selection of 400000 tabs.

Spytunes : Learn guitar with Spy Tunes free video lessons and eBooks. Join our guitar community and learn guitar with people from all over the world.

Play Bass Now : Free bass lessons, funk bass exercices, bass guitar lessons, bass tutorials.

Piano :

How to play piano : A place to learn how to play piano for free!

Others :

Rhyme Zone : A language arts reference tool and comprehensive search engine for words. Includes the functions of a rhyming dictionary, thesaurus, and spelling checker.

Write Rhymes : As you write, hold the alt key and click on a word to find a rhyme for it.

 

Languages :

Duolingo : With Duolingo you learn a language for free, while helping to translate the web.

Memrise : The Memrise community uses images & science to make learning languages and facts child’s play.

Live Mocha : Online language community. Learn a language and connect with native speakers for instructive help.

My language exchange : Practice and learn foreign languages with native speakers via email, text chat, voice chat or meet up for face to face conversation exchange.

Learning Languages : If you are a foreign language enthusiast, a polyglot or just want to learn a new language on your own, you will find here what you need.

Transition Words

The Everyday Writer : The twenty error patterns (other than misspelling) most common among U.S. college students

 

Photography :

Simple guide to Photography

The Three Basics of Exposure and Photography

Digital Photography : Digital Photography course by Stanford.

Photography Class : A class to learn photography.

Photo Net : Photography tips and techniques.

Exposure Guide : A great resource for photographers of all skill levels.

Luminous Landscape : The web’s most comprehensive site devoted to the art of landscape and nature.

Concept Art Forum : A web community of artists who are here for one purpose : helping each other learn about art.

Deviant Art : Community of artists and those devoted to art.

Color Theory : A guide about color theory.

 

How to  :

eHow : Learn how to do just about everything at eHow. Find expert advice along with How To videos and articles.

How Stuff Works: How Stuff Works explains thousands of topics, from engines to lock-picking to ESP, with video and illustrations so you can learn how everything works.

Wonder How To : Wonder How To is your guide to free how to videos on the Web.

iFixit : Repair your electronics yourself. iFixit is the repair manual you can edit.

PC Gaming Wiki : PCGamingWiki aims to collect all fixes and workarounds for every single PC game, where it can always be kept up to date.

 

Others  :

Guidelines on Writing a Philosophy Paper

Old maps online

Computer Related

Code Academy : Codecademy is the easiest way to learn how to code. It’s interactive, fun, and you can do it with your friends.

Site du Zero : Tutoriels pour débutants en programmation et développement web.

WordPress : A semantic personal publishing platform with a focus on aesthetics, web standards, and usability. That’s what i’m using for this site.

Ebooks

Library Genesis : 32+ millions free ebooks download in many languages, no subscriptions no limits.

Tuebl : The ultimate ebook library.

Open Humanities Press : An international open access publishing initiative in the humanities, specializing in critical and cultural theory.

Les Classiques des sciences sociales : Une bibliothèque numérique unique et originale dans le monde francophone en sciences sociales et humaines.

Project Gutenberg : Free eBooks

Planete Book : We offer an assortment of classic novels and books in electronic form which you are free give to your friends, classmates, students, anyone.

The Free Library : One of the largest online libraries in the world — Millions of news, trade publications, newspapers, magazine, journal and reference.

Google Books : Search and preview millions of books from libraries and publishers worldwide.

Open Book Project : The Open Book Project is aimed at the educational community and seeks to encourage and coordinate collaboration among students and teachers for the development of high quality, freely distributable textbooks and educational materials on a wide range of topics.

Wikibooks : Wikibooks is a Wikimedia community for creating a free library of educational textbooks that anyone can edit.