GENERATORS:

Text Content Generator - http://www.lipsum.com

Favicon Generator - http://tools.dynamicdrive.com/favicon

Data Generator - https://mockaroo.com/

Mobile Mockup Generator - https://mockuphone.com

Logo Generator - https://www.logaster.com

UUID Generator - https://www.uuidgenerator.net/

Hash Generator - https://passwordsgenerator.net/sha256-hash-generator/

Ultimate Code Generator - https://webcode.tools/

IMAGE RESOURCES:

Free Stock Images - https://www.pexels.com

Free Stock Images With Great API - https://unsplash.com/

Free Vectors, mockups - https://www.freepik.com

Dummy Image Placeholders - https://source.unsplash.com/

Dummy Image Placeholders - https://placeholder.com

Free Icons - https://www.iconfinder.com

CODE OPTIMIZATION:

Minify JS & CSS - http://minifier.org

Code Optimization Tools - https://codebeautify.org

Code Diff Checker - https://www.diffchecker.com

CONVERTERS:

ES6+ & JSX Compiler - https://babeljs.io/repl

Sass Converter - https://www.sassmeister.com/

Less Converter & More - http://www.webtoolkitonline.com

Markdown Editor - https://stackedit.io

Jade Converter - http://www.html2jade.org/

IMAGE COMPRESSION:

Compress All Images - https://compressor.io/compress

Compress JPG - http://jpeg-optimizer.com/

Compress PNG - https://tinypng.com/

VALIDATION & COMPATIBILITY:

Validate HTML - https://validator.w3.org

Validate CSS - https://jigsaw.w3.org/css-validator

Check Browser Compatibility - https://caniuse.com/

ES6+ Compatibility Table - https://kangax.github.io/compat-table/es6/

IN BROWSER CODING:

Client Side Code - https://codepen.io

Client Side Code - https://jsfiddle.net

Client Side Code - http://liveweave.com

Server Side Code - https://repl.it

SNIPPET TOOLS:

Snippet Manager - https://gist.github.com

Snippet Manager - https://pastebin.com

COLOR & DESIGN:

Create Color Schemes - https://color.hailpixel.com

Get Color Schemes of Websites - http://stylifyme.com

Create Gradients - https://uigradients.com

CSS Button Generator - http://css3buttongenerator.com

HTML Entity Lookup - http://entity-lookup.leftlogic.com/

RESPONSIVENESS:

Device Testing - http://www.responsinator.com

What's My Browser Size - https://www.webpagefx.com/tools/whats-my-browser-size/

WIREFRAME:

In Browser Wireframing - https://app.moqups.com

Very Basic In Browser Wireframing - https://wireframe.cc

SPEED TEST:

Speed & Performance Testing - https://tools.keycdn.com/speed

Pingdom Speed Test - https://tools.pingdom.com/

OTHER:

Public API Resources - https://github.com/toddmotto/public-apis?utm_source=mybridge&utm_medium=blog&utm_campaign=read_more

Organized Docs for all Popular Web Technologies - https://devdocs.io