https://www.youtube.com/watch?v=ZXmsu00sKcs (https://www.youtube.com/watch?v=ZXmsu00sKcs)
There is a bit of a language barrier, but this guy appears to be using 1-way bearings (like on a bicycle)
to cause a series of pendulums to turn a shaft.
it looks pretty interesting. though im not sure how much of this energy might be "free".....