Here's a decent list I found. Feel free to add any that anyone knows of.
From this VQ Link:
List of Tennessee players and commits playing summer baseball
Cape Cod League (8)
RHP Tegan Kuhns (Brewster Whitecaps): 0-0, 1 GS, 0.00 ERA, 4.0 IP, 6 SO, 0 BB
RHP Brayden Krenzel (Orleans Firebirds): 1-0, 1.69 ERA, 2 APP, 5.1 IP, 4 SO, 4 BB
SS Manny Marin (Brewster Whitecaps): 2 GP, .000 (0/6), 3 BB, 1 SB, 2 R
UTL Chris Newstrom (Falmouth Commodores): 5 GP, .071 (1/14), 3 BB, 1 SB, 1 R
C/OF Levi Clark (Wareham Gatemen): 4 GP, .375 (6/16), 1 HR, 1 RBI, 5 R, 1 BB
*RHP Bo Rhudy (Yarmouth-Dennis Red Sox): 0-0, 2.25 ERA, 3 APP, 4.0 IP, 5 SO, 2 BB
*C/OF Garrett Wright (Yarmouth-Dennis Red Sox): 5 GP, .214 (3/14), 1 R, 1 SB, 1 BB
*OF Henry Ford (Chatham Anglers): 8 GP, .207 (6/29), 1 HR, 4 RBI, 4 R, 3 2B, 1 SB, 7 BB
California Collegiate League (1)
RHP Nic Abraham (Santa Barbara Foresters): 0-0, 0.00 ERA, 1 APP, 1.0 IP, 1 SO, 0 BB
New England Collegiate League (1)
UTL Hunter High (Martha’s Vineyard Sharks): Arrives on Wednesday to join the team.
Appalachian League (5)
RHP Aidan Hayse (Kingsport Axmen): 0-0, 10.80 ERA, 4 APP, 5.0 IP, 5 SO, 9 BB
SS/3B Dane Morrow (Johnson City Doughboys): 11 GP, .262 (11/47), 9 RBI, 8 R, 4 BB
C Brooks Wright (Bristol State Liners): 9 GP, .290 (9/31), 1 HR, 5 RBI, 8 BB, 3 2B, 3 R
OF Jaxon Walker (Bristol State Liners): 12 GP, .167 (7/42), 1 HR, 7 RBI, 1 SB, 5 R, 8 BB
*2B Tyler Myatt (Kingsport Axmen): 10 GP, .310 (9/29), 2 HR, 7 RBI, 8 R, 11 BB
– Myatt will be playing in the Cape Cod League in the next few weeks.
Northwood League (1)
RHP Tate Strickland (Green Bay Rockers): 2-1, 2.70 ERA, 5 APP, 1 GS, 10.0 IP, 15 SO, 3 BB
Prospect League (1)
OF Brennon Seigler (Johnstown Mill Rats): 10 GP, .324 (12/37), 1 HR, 8 RBI, 5 SB, 7 R, 5 BB