Pololu - Continuous-rotation servos and multi-turn servos
360 Degree servo Motor, DS04-NFC 360 Degree continuously Rotating DC servo servo DC Gear Motor with Continuous Rotation for RC Robot etc, Power Consumption <1000mA, Torque 5.5kg / cm (at 4.8V) :
3kg.cm 360 Degree Continuous Rotation Servo
Micro 360 Degree Continuous Rotation Servo
Feedback 360 Degree - High Speed Continuous Rotation Servo : ID 3614 : $27.99 : Adafruit Industries, Unique & fun DIY electronics and kits
3D-Printed Servo Motor Has 360 Degrees Of Rotation | Hackaday
TowerPro SG90 Continuous Rotation 360 Degree Servo Motor - Robotools
How to Control a 360 Degree Servo Motor with Arduino - Makerguides.com
Make a 360° Continuous Rotation Servo Motor | CircuitBread