My router died. Started fine, sounded like spindle lock was dragging but spindle was turning, Stopped running. Has power to plug, spindle freely turns but motor doesn't work

Check and test switch--brushes - bearings

The router motor has much in common with the humble vacuum cleaner motor - the first routers used those motors.
The series-wound brush-type AC motor is electrically very noisy and self-generates many spurious currents so these motors are perpetually trying to destroy themselves. It should never be a surprise when the internal insulation fails and the motor begins to run slow and sounds as though something is dragging.
These motors need a good supply of cooling air so it is important to keep the ventilation system clean. Without lots of cooling air a hard working motor will quickly overheat with the same result.

The most surprising thing about these motors is just how durable and long-lasting most of them are.

Your router will have to be dismantled and examined. Assuming the power is reaching it and the switch is good it is possible the speed control (if fitted) has failed or if you are really lucky a motor brush has stuck or worn out - that often sounds as though something is dragging.