I am pleased to share extensions of two canonical (1 & 2 below) and a customised (3 below) themes,
1. sphinx-rtd-theme
A new repository, sphinx https://github.com/jinghuazhao/sphinx, highlights the long-awaited adoption of the theme incorporating the master logo and link.
2. jekyll-rtd-theme
Inspired by the extension above, the cambridge-ceu/csd3 site https://cambridge-ceu.github.io/csd3/ now collapses on the side bar while showing summary information on each category and giving remarkable visual simplification.
3. srcf
The SRCF-style site is showcased here, https://jinghuazhao.github.io/srcf/.