Gitter - real-time chat integrated with GitHub. Like IRC - but modern :) Issues, markdown, code highlight and external integrations
PsySH - a runtime developer console, interactive debugger and REPL for PHP. Looks like the coolest dev tool after xDebug. But could not run debug correctly on basic Vagrant+Apache due to missing $HOME env param.
Gitter - real-time chat integrated with GitHub. Like IRC - but modern :) Issues, markdown, code highlight and external integrations
Pageres - NodeJS tool to create a website screenshots in different resolutions (for responsive layout testing). Based on PhantomJS.
Elastic Search 1.0 is released!
Great collection of HTML/CSS only animations CSS A/Z
Leaflet Heatmap visualization plugin. Works very fast and responsive on big amount of points. Demo