http://squizlabs.github.io/HTML_CodeSniffer/
http://www.3pillarglobal.com/insights/accessibility-testing-tools-and-techniques
https://tenon.io/testNow.php?url=http://demo.citizenbudget.com/
http://khan.github.io/tota11y/
http://mozilla.github.io/nunjucks/
Sort/Filter tables - http://www.listjs.com/
Autocomplete (couldn't make the demo work) - https://leaverou.github.io/awesomplete/
WYSWYG editor - http://quilljs.com/
Polyfill for Picture Element (Go Retina!) - http://scottjehl.github.io/picturefill/
Multiselect - https://github.com/Fabianlindfors/multi.js
Client-side Search - http://elasticlunr.com/
sketch(particles) - http://soulwire.github.io/sketch.js/
CSS framework - http://bulma.io/
Animation gallery - http://anicollection.github.io/#/
Responsive CSS - http://bradfrost.com/demo/ish/
Styleguide as a Service - http://runway-app.cfapps.io/guest_styleguides/new
SVG Logos - https://simpleicons.org/
Text Size Plugin - https://github.com/rikschennink/fitty
Text Animations - http://tobiasahlin.com/moving-letters/
SVG Animations - https://www.svgator.com/?utm_source=facebook&utm_medium=banner&utm_campaign=fb_adillustr_beta
Pre-processing D3 (Gulp) - https://github.com/fivethirtyeight/d3-pre
Brite Charts - https://eventbrite.github.io/britecharts/
http://jvectormap.com/maps/world/africa/ http://kartograph.org/ http://datamaps.github.io/
https://getcockpit.com/documentation/getting-started/introduction (open source)