Here's a glimpse of the next @w3c Mobile Checker. Stay tuned!
https://twitter.com/w3cdevs/status/605801502955864064
@w3c legacy Markup validator is now on Github https://github.com/w3c/markup-validator although emphasis is more on html5 Validator.nu https://github.com/validator/validator
https://twitter.com/w3cdevs/status/613375431199342592
We are excited to announce the alpha release of the new @w3c Mobile Checker. https://www.w3.org/blog/2015/the-new-w3c-mobile-checkers-alpha-release-be-mobile-friendly/ #BeMobileFriendly
https://twitter.com/w3cdevs/status/613418447922315264
The new @w3c Mobile Checker is on @github. Check it out! https://github.com/w3c/Mobile-Checker #BeMobileFriendly
https://twitter.com/w3cdevs/status/613462080579063808