which software projects have quality online documentation

Question

I love the php.net site's documentation for the php language. Its my favourite documentation for any project i have come across. Its really easy to jump to functions and quickly understand how to use them (or navigate to a better alternative solution).

US: http://www.php.net/manual/en/

UK: http://uk2.php.net/manual/en/function.print.php

MySQL is great too.

To have 'a favourite documentation' is quite geeky in itself. So this is the perfect place to ask.

Just out of interest, which programming language/framework/project has the best official online documentation?

What's your fave documentation and how does it satisfy your expectations of 'good documentation'?

Answer 1

jQuery

Answer 2

The Flourish library docs is cleanly done and practical.

Answer 3

Spring - awesome documentation, awesome javadoc.

Answer 4

The grails documentation has impressed me. It is generated by a framework that can be reused.

Answer 5

Hibernate/NHibernate is not bad.

https://www.hibernate.org/5.html

Answer 6

As long as StackOverflow is around, they all have the best online documentation. ;o)

Answer 7

I have found the codex on wordpress.org very useful. Some of the material is out of date (applies to older versions), but in general it is very good. In the detail, but also in the high level overview of how things fit together.