Feedback about dmrg++ can be sent to gz1 at ornl. gov or an issue can be left at github.com. If you are interested in using DMRG++ for a particular case study (tight-binding model for a specific material), you might consider submitting an application for a user proposal through the CNMS, during their call window. There are calls throughout the year. The same is true if you or your group at your University or National Laboratory has a strong interest in the technicalities of the DMRG algorithm (or related algorithms), and you like the approach taken by DMRG++. Thanks for your interest in DMRG++!
You can follow DMRG++ history.