Adaptivetheme is a powerful theme framework designed from the ground up to power modern, cross browser/cross device websites using responsive design techniques.
ATD8 and is very close to a release candidate and is usable as a Drupal 8 base theme right now.
# Project URL
# Where is the code?
# Estimated completion date
Release candidate before Nov 25th (2015). Full release by the end of the year.
Stable base theme (included with Drupal 8 core).
# Who's doing the port?
# What help do they need?
Testing. Install, generate sub-themes, try to break it. Cross browser testing is very important, e.g. Edge on Win10, Chrome on Android etc.