Chromium(Google) stuff
http://www.chromium.org/
https://planet.chromium.org/
http://blog.chromium.org/
http://v8project.blogspot.com/
https://groups.google.com/forum/#!forum/v8-dev
http://chrome.blogspot.com/
http://planet.igalia.com/chromium/
http://googlechromereleases.blogspot.com/
http://peter.sh/commits/
https://code.google.com/p/chromium/issues/list
https://groups.google.com/a/chromium.org/forum/#!forum/blink-dev
https://code.google.com/p/v8/issues/list?q=label:Harmony
Webkit(Apple) stuff
http://www.webkit.org/
https://www.webkit.org/blog/
http://www.webkit.org/status.html
http://planet.webkit.org/
http://planet.webkitgtk.org/
http://hansmuller-webkit.blogspot.com/
http://planet.igalia.com/webkit/
http://www.webkitbits.com/
https://developer.apple.com/library/safari/navigation/
https://bugs.webkit.org/
Adobe stuff
http://webplatform.adobe.com/
http://blogs.adobe.com/webplatform/
http://blogs.adobe.com/dreamweaver
Opera stuff
https://dev.opera.com/
Mozilla stuff
https://hacks.mozilla.org/
https://www.mozilla.org/en-US/firefox/releases/
https://bugzilla.mozilla.org/
https://groups.google.com/forum/#!forum/mozilla.dev.platform
https://groups.google.com/forum/#!forum/mozilla.dev.tech.layout
IE, Edge, Microsoft stuff
http://blogs.windows.com/msedgedev/
http://blogs.msdn.com/b/ie/
http://dev.modern.ie/
https://status.modern.ie/
Accessibility http://www.paciellogroup.com/blog/archive/ http://a11yproject.com/