Introducing SVT-AV1: a scalable open-source AV1 framework
https://medium.com/netflix-techblog/introducing-svt-av1-a-scalable-open-source-av1-framework-c726cce3103a

SVT-AV1 is currently work in progress since it is still missing the implementation of some coding tools and therefore has an average gap of about 14% in PSNR BD-rate with the libaom encoder in a 1-pass mode.
The following features are planned to be added and will decrease the BD-rate gap:

Multi-reference pictures
ALTREF pictures
Eighth-pel motion compensation (1/8-pel)
Global motion compensation
OBMC
Wedge prediction
TMVP
Palette prediction
Adaptive transform block sizes
Trellis Quantized Coefficient Optimization
Segmentation
4:2:2 support
Rate control (ABR, CBR, CBR)
2-pass encoding mode