Editing software for HTML and CSS:

Brackets

W3CValidation - Adds W3C Validation to Brackets.
Download zip file and drag to Brackets extension manager.

Text editing software for HTML and Java:
  TextPad web site

A slightly more advanced HTML editor:

  HTML Kit

Image editing software:
  Irfanview web site or Irfanview Austria web site

Paint.net web site

Gimp web site

HTML help and validation software:

http://www.htmlhelp.com

http://validator.w3.org/
 

Video/Screen capture software:

Open Broadcaster Software