https://247sports.com/Season/2019-Football/TransferPortal/
Looks like the guys at 247 have at least some of the whose who in the transfer portal, or at least their own version.
I just saw Chris Bleich (OL-Florida) entered the transfer portal. At one point there were some crystal balls for Nebraska unless I have the wrong guy.
https://247sports.com/PlayerInstitution/Chris-Bleich-at-Wyoming-Valley-West--138659/CurrentExpertPredictions/
https://247sports.com/college/florida/Article/Chris-Bleich-transfers-name-in-NCAA-transfer-portal-Florida-Gators-Football-138069818/