Starting pitchers:
Freddy Peralta (2 Club options remain)
Aaron Civale (Arb 3)
Colin Rea (Club)
Tobias Myers (pre-Arb)
Injured but available at some point: Robert Gasser, Brandon Woodruff
Option decision pending: Wade Miley ($12 million mutual)
Former starters: Aaron Ashby, DL Hall, Jacob Misiorowski
Minor league options: Carlos Rodriguez
Minor league options that need 40 man decisions this winter: Chad Patrick, Shane Smith, Logan Henderson
Options a plenty here. Peralta, Civale, Rea, and Myers seem like locks. After that they could look a bunch of players in the organization, including Wade Miley if both sides want to stay together. I think $12 million is too rich for such an injury risk, but

Relief pitchers:
Devin Williams (Arb 3)
Hoby Milner (Arb 3)
Joel Payamps (Arb 2)
Trevor McGill (Arb 1)
Jared Koenig (pre-Arb)
Aaron Ashby
DL Hall (pre-Arb)
Enoli Paredes (pre-Arb)
Bryse Wilson (Arb 2)
Nick Mears (Arb 1)
J.B. Bukauskas (pre-Arb)
Elvis Peguero (pre-Arb)
Bryan Hudson (pre-Arb)
Abner Uribe (pre-Arb)
Rob Zastryzny (pre-Arb)
Minor league options: Jacob Misiorowski, Craig Yoho
Minor league options that need 40 man decisions this winter: Russell Smith
Laugh. Out. Loud. Just absurdly loaded.
The Brewers should see what they can get for Devin. If there's a market for Hoby then send him out too.
DH:
Christian Yelich
Gary Sanchez (mutual option)
Sanchez seems unlikely to be back after posting a 97 OPS+ this season. Yelich is the obvious choice here.
Catchers:
William Contreras (Arb 1)
Eric Haase (Arb 2)
Gary Sanchez (mutual option)
Minor league options: Jeferson Quero
I could see them bringing Haase back as insurance until Quero is ready to go. Even then Haase might be a solid backup option in the event Quero takes over the roll of starting catcher with Contreras moving to DH.
First Base:
Rhys Hoskins (player option)
Jake Bauers (Arb 2)
Minor league options: Tyler Black, Mike Boeve
Minor league options that need 40 man decisions this winter: Wes Clarke, Ernesto Martinez
I'll be surprised if Hoskins declines his option. Bauers is a non-tender candidate they should look to upgrade. Black...who knows. I think Wes Clarke is an interesting option to take Sanchez's spot. He would have to be added to the 40 Man but he could take over as the 3rd DH/1B/C.
I don't know what the plan is for Ernesto Martinez is, but I'd like to bring him back. He was really good in the 2nd half of the season.
2B/3B/SS
Brice Turang (pre-Arb)
Joey Ortiz (pre-Arb)
Andruw Monasterio (pre-Arb)
Minor league options Oliver Dunn (pre-Arb), Isaac Collins (pre-Arb), Owen Miller (pre-Arb), Vinny Capra (pre-Arb), Mike Boeve
Outside of Turang and Ortiz, woof. Think this is where we hit up FA for a one or two year stopgap. Boeve is a dark horse candidate. He can play 3rd, 2nd, and 1B and has hit wherever he's played. It's a shame that Wilkin fell so flat on his face this season. With a boatload of guys in the org right behind him he needs to rebound in a huge way next season.
LF/RF/CF
Chourio
Mitchell (pre-Arb)
Frelick (pre-Arb)
Perkins (pre-Arb)
Minor league options Isaac Collins (pre-Arb), Brewer Hicklan (pre-Arb), Carlos D. Rodriguez
The major league OF is set. I might sneakily look to upgrade Frelick, but I think the Brewers roll with the four man group they have. Not a ton of help available in the upper levels of the minors, but they've got options if guys go on the IL, not to mention Yelich moving back to the OF if needed.
Overall
It's pretty wild how well the Brewers are set up going into next season. Rotation and bullpen are set. They could (and should) trade Devin and not miss a beat. They'll need to sign a starting infielder. There isn't really an internal option at whatever position Turang and Ortiz don't play. That said, there is some bottom of the roster depth. Outfield is set, which is a good thing because there aren't any legit options in Nashville or even Biloxi.