These are my personal favorites that I use all the time.
An all-in-one [AIO] Javascript tool.
An all-in-one [AIO] CSS tool.
An all-in-one [AIO] HTML tool.
An all-in-one [AIO] PHP tool.
An all-in-one [AIO] Text tool.
A collection of bookmarklets from across the net.
Import or generate Meta Tags for your webpage
Check your internet connection speed.
Script MIA !?!?
Converts text in and out of base64 encoding.
Bookmarklets
Brand Colors
Checks webpage for broken links.
Converts byte, to KB, MB, GB and TB, PB, EB, ZB, YB, XB,WB, VB, UB, etc.
Decrypts $_F=__FILE__, edoced_46esab, eval..., etc.
Compares the amount of text and code on a webpage.
Shows a boat-load of color chips and their HEX code.
Color Converter
Displays info from your computer that is available to websites.
Digs up info about your domain.
Encodes Email address to JavaScript to help reduce spam.
Encodes files to base64.
Cracks FIOS WEP keys
Convert SVG to data:image
Google Hacking
Converts text in and out of base64 encoding with gzip compression.
Converts text to any major algorithm.
Encrypts HTML to JavaScript document write.
Compresses HTML to reduce the room and size of the document.
View a webpage just as a search engine sees it.
Creates User & Pass for Apaches htaccess.
See what the header response is on your website.
Converts text to JavaScript doc write
JS Kit Password RecoveryCracks JavaScript passwords by ePassword
JSON Linter
Suggests keywords based on the text of your webpage.
Collects all the links on a webpage.
Checks to see if your website is online.
Link Validator
Meta Tag Viewer
Use this to copy and paste from MS Word. Strips all formatting!!
Check to see if a domain name is available.
Strong passwords that are easy to remember.
Checks to see if a page is redirecting properly.
Get IP address by domain name, or vise-versa
Rotates text by 5, 13, 18, 47 characters.
Checks to see if two websites are from the same server class.
Social Buttons
MySQL code to find and replace in the database.
Attempts to tabbify (add tabs) to code
Converts text to different encodings.
Compares two blocks of text to find differences.
Does all kinds of fun stuff with text!!
CSS Text Stroke Outside
Converts epoch to human and human to epoch.
Calculates Up and Down Time
This can be used to properly encode a URL.
Test the speed of your website.
Checks to see if your website is online and returns header code.
Get Who Is information about a website.