GELLO is a general, low-cost teleoperation framework for robot manipulators. It uses a Dynamixel-based leader device to control various follower robots (Franka FR3, YAM, UR, xArm, Panda) in real-time via ZMQ-based distributed architecture. The system supports both simulation (MuJoCo) and real hardware, includes gravity compensation (FACTR) for YAM robots, and provides data collection pipelines for imitation learning. It also offers ROS2 integration for Franka FR3 with custom joint impedance controllers and gripper managers. The codebase is configuration-driven via YAML files and demonstrates strong engineering practices with pre-commit hooks, CI workflows, and reusable abstractions for robots, agents, and cameras.