- PHP - http://php.net/docs.php
- JavaScript - https://developer.mozilla.org/en-US/docs/Web/JavaScript
- Python - https://www.python.org/doc/versions/ ( escolha a versão ).
- Java - http://docs.oracle.com/javase/7/docs/api/
- Ruby - http://ruby-doc.org/
- Perl - http://www.perl.org/docs.html
- C/C++ - http://en.cppreference.com/w/
- Haskell - http://www.haskell.org/haddock/doc/html/index.html
- Scala - http://docs.scala-lang.org/
- Shell script - http://www.tldp.org/LDP/abs/html/
- Prolog - http://www.swi-prolog.org/pldoc/index.html
- Lua - http://www.lua.org/docs.html
- Lisp - http://lispdoc.com/index
- C# - http://msdn.microsoft.com/en-us/library/67ef8sbd.aspx
- Pascal - http://www.freepascal.org/docs-html/ref/ref.html
- Swift - https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/
- ActionScript - http://help.adobe.com/en_US/as3/dev/index.html
- Bash - http://www.gnu.org/software/bash/manual/html_node/
- AppleScript - http://goo.gl/ZFWgla
- Cobol - http://cobolstandard.info/wg4/document.html
- CoffeScript - http://coffeescript.org/
- D - http://ddili.org/ders/d.en/index.html
- Cython - http://cython.org/#documentation
- Go - http://golang.org/doc/
- Hack - http://docs.hhvm.com/manual/en/index.php
- Idris - http://www.idris-lang.org/documentation/
- Lisp - https://leanpub.com/lispweb
- Objective-C - http://goo.gl/wJp4uT
- Objective Pascal - http://www.freepascal.org/docs-html/ref/ref.html
- Rust - http://doc.rust-lang.org/index.html
- SmallTalk - http://en.wikibooks.org/wiki/Smalltalk_Programming
- Html5 - http://goo.gl/7nPngs
- Css3 - https://developer.mozilla.org/en-US/docs/Web/CSS
- YQL - https://developer.yahoo.com/yql/docs/
- ECMAScript - http://www.ecma-international.org/ecma-262/5.1/
- Processing - http://processing.org/reference/
- ZPL - http://goo.gl/D5KNE2
- TypeScript - https://typescript.codeplex.com/documentation
- Dart - https://www.dartlang.org/
- Julia - http://julialang.org/
- Jade - http://jade-lang.com/
- ADA - http://www.adacore.com/developers/documentation
- Ecl - http://ecls.sourceforge.net/new-manual/
- Tcl - http://www.tcl.tk/doc/
- Erlang - http://www.erlang.org/doc.html
Autor(a) original: Yanni H. Baldaya
Ah, muito obrigado, eu apenas copiei os links, não cheguei a verificar todos (muito menos recebi alguma notificação do seu comentário), mas já vou tratar de arrumar os links "quebrados". Valeu!