Maven: The Complete Reference

Learning Maven can be a daunting and frustrating task. While there are a number of references for Maven online, there is no single, well-written narrative for introducing Maven that can serve as both an authoritative reference and an introduction. Sonatype maintains two books focused on Maven: an example-driven introduction to Maven,
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Structure and Interpretation of Computer Programs

Oldie but goody Enjoy reading it here.

Process Driven Spring Applications with Activiti

Here is a webinar analyzing Spring applications with Activity.

Book References

1. Javascript / JQuery
  - 4 best JavaScript or JQuery books for beginners

2. Ruby
   - 6 Best Books for Learning or Advancing your Ruby Knowledge
 

MIT video lectures and material

For those that never had the chance to graduate from MIT here is an online resource of video lectures from almost all courses.

Those that want to jump start from computer science you can start from here.

thinkster.io

Thinkster.io is another great online learning center. Try it out

Eloquent JavaScript

A nice online intro to javascript here

Codecademy

Codecademy is a neat on line learning center.