List of all Java APIs (JSR's)
Entry to W3C web standards
RCF Editor (Official Internet Protocol Standards)
JEE7 Overview (Whitepaper from Oracle, some branding)
Different types of managed beans
CDI reference (Weld)
Bean Validation reference
JavaEE 7 Samples (many and advanced)
NetBeans
Maven
JavaDB, Derby
Git Tutorial
HTML5 Specification
HTML5 vs HTML4
XHTML vs HTML
HTML vs XHTML vs Polyglot HTML
HTML5 Compliant tutorial
HTML5 Compliant tag reference
HTML5 Flowchart (what to use when...)
CSS reference
Bootstrap Components
ECMA (JavaScript) specification
JavaScript (core) reference
JavaScript in Detail, "this"
Gotchas
AngularJS
How to learn AngularJS
Jasmine (JavaScript testing)
JQuery API
HTML Landscape Overview (JS API's)
JavaScript Design Patterns
JavaScript API Demos (HTML5)
Metro (JAXB implementation)
JAXB annotations
Jersey (JAX-RS implementation) User Guide
SocialAuth
OAuth 2 In Depth
Article: Designing REST (HATEOAS)
JSF Home (Mojarra)
Nice overview article, JSF, CDI, ...
JSF tag reference
ICEFaces
ICEFaces ACE components
PrimeFaces
PrimeFaces components
JPA Reference
JPA JPQL Reference
JPA CriteriaAPI reference
Web Socket API
Web Sockets Documentation MDN
ICEFaces push (PushRender API)
PrimeFaces push
Server Sent Events Specification