Some commonly used emulators for Conquer Online include COPS v7, CoEmu, and Redux. COPS v7, developed in C++, is frequently used for the 5065 patch, while CoEmu provides a Rust-based option for Conquer 2.0 and Redux offers a C# foundation, supporting versions up to patch 5065. Each emulator is tailored to different patches and offers unique features and stability depending on the version of the game.