We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:
https://discuss.afni.nimh.nih.gov
Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.
The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.
It's included in the source on github (https://github.com/afni/afni/tree/master/src/matlab) or on this site here. I'll say that it hasn't been updated in quite a while. You could also convert any AFNI dataset to NIFTI and then use functions in Matlab for importing those NIFTI files. Though the AFNI Matlab tools still worked the last time I tried them.