Tools

HTML Validator

validator.w3.org/ Checks your HTML code to make sure it's up to standards.

CSS Validator

jigsaw.w3.org/css-validator/ Checks your CSS to make sure it's up to standards.

MungeMail

brasil2.statenews.com/apps/mungemail/ Converts text into ascii codes. Mostly used for converting E-Mail addresses making it harder for spambots to read them from your website.