- Cool Backgrounds – A collection of tools to create compelling, colorful images for blogs, social media, and websites
- unDraw Illustrations – Browse to find the images that fit your needs and click to download
- Streamline – World's largest icon library
- Icons8 – All icons are done by a single designer, so your work will look consistent
- Simple Icon – Free SVG icons for popular brands
- SVGRepo – 170.000+ Free SVG Vectors and Icons
- Noun Project – Over a million curated icons
- Icon Finder
- Icon Store
- Favicon Generator
- Font Awesome – vector icons and social logos on your website
- Size Marks PS – A Photoshop™ script that makes measurement marks
- Responsive Breakpoints – Easily generate the optimal responsive image dimensions
- Freebie Suply – Design & Code – Awesome list with tons of resources
- Spoon Graphics – Ready to use graphic assets
- Lunapic – Free online photo editor with lots of effects
- Semantic UI
- 10 Usability Heuristics for UI Design
- Accessibility Guidelines Checklist
- 18F Accessibility Guide Checklist
- UX Recipe
- UX Checklist
- IxD Checklist
- Web Designers Checklist
- Usability Checklist
- Device Metrics – resources for size and resolution across multiple devices
- Contrast Checker – input text/bg hex codes for accessible contrast testing
- Hex Naw – test entire color systems for accessible contrast
- Color Oracle – open source macOS color blindness simulator
- Sketch – The digital design toolkit
- Atomic – Under construction
- Subform – Visual tool for creating dynamic UI layouts
- Carbon – IBM’s open-source design system for products and experiences
- Lightning – Salesforce design system
- Clarity – UX guidelines, HTML/CSS framework, and Angular components working together to craft exceptional experiences
- Polaris – Shopify design system
- Plasma – WeWork design system
- Build – Intercom design system
- Style Guide Resources – Real life pattern libraries, code standards documents and content style guides
- Style Guide Guide – A boilerplate for creating superb style guides
- UX Power Tools – A design system UI kit for Sketch
- Brand.ai – Easily manage your Design System
- Design Principles FTW – The biggest collection of Design Principles on the Internet
- BEM – Block, element, modifier methodology
- Materialize – responsive CSS framework based on Material Design
- Monkey Test It – fully automated website testing
- Can I Use? – up-to-date browser support tables for support of front-end web technologies
- Animate.css – a cross-browser library of CSS animations
- CSS Beautify
- Athena – HTML to PDF conversion
- CSSmatic – the ultimate CSS tools for web designers
- GeoPattern – Generate beautiful SVG patterns
- txti – Fast web pages for everybody
- React Toolbox – Bootstrap your application with beautiful Material Design Components
- NativeBase – Native look with platform specific design over the same JavaScript code-base
- Atom – open source text editor created by Github
- Kite – artificial pair programmer
- Wappalyzer – identify what libraries and frameworks a site uses
- JSON Validator
- JSON Editor Online
- RegexPal – a JavaScript regular expression tester
- SQLify – Convert any CSV or JSON file to a SQL, JSON or CSV file
- Death to Stockphoto
- Gratisography
- Magdeline
- Pexels
- Unsplash
- Unsplash It – placeholders using images from unsplash
- Covver – free videos for your homepage
- Mazwai – free stock videos online
- RetroSupply – well-made and well-priced assets that skew toward retro/vintage
- YouWorkForThem – cool textures and imagery
- Graphic Burger – design resoruces free for both personal & commercial use
- Pixedem – physical product mockups & templates
- Place It – thousands of Free iPhone, iPad, iMac and Macbook Mockups
- Magic Mockups
- Dunnnk
- Frame
- Adobe Experience Design – for creating wireframes and protoyping interactivity
- Craft by Invision – prototyping, collaboration & workflow platform
- Figma – interface design tool with real-time collaboration
- Atomic – prototyping tool for mobile or desktop interactions or animations
- Coggle – simple Collaborative Mind Maps
- Lucidchart – flowchart and diagram maker
- Prototypo – create your own font in a few clicks
- Type Genius – find the perfect font combo for your next project
- Type Anything – a simple tool to create great font combinations
- Free Fonts Collection – The ultimate collection of the top 100 free typefaces for 2015
- Tiff – a type diff tool that visually contrasts the differences between two fonts
- Lutify.me – free cinematic color grading LUTs
- Colllor – color palette generator
- Clrs.cc – really pretty default colors for prototyping
- Coolors – interactive color palette generator
- Palettable – another interactive color palette generator
- Random a11y – accessibility-friendly color for text & background combinations
- Material Pallete
- Material Design Colors
- Material UI
- Brand Colors
- Web Colour Data
- Swiss Style Color Picker
- Color Hex
- Color Claim
- Name that Color
- Keyword Tool
- Does your site follow the Google webmaster guidelines?
- W3C Markup Validation Service – Check the markup (HTML, XHTML, …) of Web documents
- Google Webmasters Search Console
- Infogram – charts & infographics the easy way
- Visme – presentations, infographics & other engaging content
- Thingiverse – half-million 3D models available to print for free
- YouMagine – steady stream of high-quality 3D printable content for free
- Cults – curate collections (free + paid)
- Sculptris – "virtual clay" for begginers
- Autodesk 123D Suit – a collection of 3D modeling tools
- 123D Catch – free app that lets you create 3D scans of virtually any object
- TRNIO – convert existing photographs into 3D models directly on your iPhone
- Storylne – Create voice apps without coding
- PullString – Design, Prototype, and Publish Voice Apps
- EchoSim – Alexa skill testing tool
- Api.ai – Natural language interactions for bots, applications, services, and devices
- Botkit – Most popular open-source toolkit for creating bots for messaging platforms
- BotWiki – Open catalog of friendly, useful, artistic online bots
- Google Cloud Vision
- Amazon Rekognition
- Microsoft Azure Vision
- Tensorflow Object Detection API
- OpenCV – Open Source Computer Vision Library
- COCO Dataset – Common Objects in Context
- Paper Sizes – International Paper Sizes, Dimensions & Formats
- Diffchecker
- Twine – Non-linear text editor
- Appear.in – Video chat made easy
- Contributor Covenant – A Code of Conduct for Open Source Projects
- SemVer – Semantic Versioning 2.0.0