Physics simulation component of Esenthel Engine was translated recently to PhysX SDK 2.8.3, which allows developers, among other things, to create 64-bit applications.
In addition, new SDK features, like hierarchical cloth solver or cloth constraints, can help to advance clothing simulation via Esenthel even further (current status is shown on a video below).
Even developed by one man – Grzegorz Slazinski – Esenthel is “complete game development suit“, which includes graphics renderer, physics, GUI, networking, animation system, etc.
User’s opionions on this engine are fairly positive.
Source: Esenthel forums