Clockwatch.de Technical and Historical Website.
A fantastic website that has been available online for some years. It boasts animations of many escapements, strike systems and other complications as well as other historical and theoretical information. If you are not familiar with this site I would strongly advise that you spend a while exploring it.
Escapement Animations - YouTube Playlist.
I came across a fantastic YouTube channel Ken Kuo. He has built fantastic CAD rendered working models of many interesting escapements. Some of these escapements are pretty rare and very interesting. Have a browse and learn about some cool escapements.