FluidBB is a plugin for Virtools Dev 4.0 (at the moment) providing a set of building blocks to simulate a fluid in a 2d texture. It is based on Stam's code from his Fluid Dynamics for Games' conference proceedings at the GDC '03.
Note : I do not have the authorization of Jos Stam for making this release and have not been able to contact him. So if you are Jos Stam or happen to know him, please drop me a message.