Here are some links to helpful websites for learning and developing software. Some websites provide free tutorials. Others are official sites of computer languages and software tools, which also provide documentation and code examples.
Codecademy.com (Code Academy)
(HTML, CSS, Javascript, PHP, Python, Ruby, APIs)
Code.org
Code.org: Hour of Code
Code.org: Learn Beyond an Hour or Code
Khan Academy (Free lessons in math, science, economics, finance, humanities, computer science)
Khan Academy: Hour of Code
W3 Schools (Free online tutorials)
(HTML, CSS, Javascript, JQuery, SQL, PHP, ASP, XML, XSLT, XPath, SVG, Google Maps)
PHP (PHP Hypertext Processor)
PHP: Documentation
JQuery (Javascript library)
JQuery: API
MySQL (Relational Database)
MySQL: Documentation
Perl (Multi-purpose programming language)
Perl: Documentation
Perl: Learning index page
Perl: CGI (Common Gateway Interface) for building webpages
Perl: Regular Expressions (text patterns)
Java (Cross-platform computer language)
Java: Tutorials
.NET (Windows)
Common runtime environment across multiple languages (C#, ASP, etc.)
.NET: Multi-platform support for Microsoft platforms (OS)
Apache Web Server
LAMP: Linux, Apache, MySQL, PHP
WAMP Server: Windows, Apache, MySQL, PHP
MIT Open Courseware
MIT OCW: About page
MIT OCW: Engineering, Computer Science
Creative Edge (online tech books & videos)
rutland tech club 