HTM Forum - Centers around the machine intelligence concept of Hierarchical Temporal Memory (HTM).
Brain Map - Accelerating progress toward understanding the brain.
NeuroCyto Lab - Want to understand how neurons are organized at the cellular level.
Neural Reckoning Group - Aim to understand the brain, and intelligent behaviour more widely, via theoretical and computational models.
Neurolib - Computational neuroscience library for easy whole-brain modeling.