Games like Fracture the Flag
Games like Fracture the Flag include Age of Empires II (Retired), Rusted Warfare - RTS, Plague Inc: Evolved, Company of Heroes 2, and Slay the Spire 2. We matched them by the tags players give Fracture the Flag on Steam (Indie, Strategy, Multiplayer, RTS, and Early Access): closest matches first, and among equally close ones the better-known games.

Age of Empires II (Retired)
Shared: Strategy · RTS · Multiplayer

Rusted Warfare - RTS
Shared: Strategy · RTS · Multiplayer

Plague Inc: Evolved
Shared: Strategy · Indie · Multiplayer

Company of Heroes 2
Shared: Strategy · Multiplayer · RTS

Slay the Spire 2
Shared: Strategy · Multiplayer · Indie

Natural Selection 2
Shared: Strategy · Multiplayer · Indie

Town of Salem
Shared: Strategy · Multiplayer · Indie

Circle Empires
Shared: Indie · Strategy · RTS

ShellShock Live
Shared: Strategy · Multiplayer · Indie

Tooth and Tail
Shared: Strategy · Indie · RTS

Wargame: Red Dragon
Shared: Strategy · RTS · Multiplayer

Buckshot Roulette
Shared: Multiplayer · Strategy · Indie

Command & Conquer™ Remastered Collection
Shared: Strategy · RTS · Multiplayer

Total War: WARHAMMER II
Shared: Strategy · RTS · Multiplayer

Age of Empires III: Definitive Edition
Shared: Strategy · Multiplayer · RTS

Silica
Shared: RTS · Multiplayer · Strategy

Castle Story
Shared: Strategy · Multiplayer · Indie

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · RTS · Multiplayer

Age of Mythology: Extended Edition
Shared: Strategy · RTS · Multiplayer

Call to Arms
Shared: Strategy · RTS · Multiplayer

Battle Realms: Zen Edition
Shared: Strategy · RTS · Multiplayer

Mount & Blade II: Bannerlord
Shared: Strategy · Multiplayer · Indie

8-Bit Armies
Shared: Strategy · Indie · RTS

Age of Empires: Definitive Edition
Shared: Strategy · Multiplayer · RTS