I would like to share a very cool project I've been working on with a couple of other very talented developers: SVT-AV1 PSY
https://github.com/gianni-rosato/svt-av1-psy
SVT-AV1-PSY is the Scalable Video Technology for AV1 (SVT-AV1 Encoder and Decoder) with perceptual enhancements for psychovisually optimal AV1 encoding. The goal is to create the best encoding implementation for perceptual quality with AV1.
We've already implemented a couple of unique features not present in mainline that do appear to produce BD-rate gains on a number of clips already!! Please check it out!