Thesis: http://mviering.de/reactiveruby.pdf

This is some interesting research, but for those hoping to code actual Ruby applications in a reactive style, I don't think this will give you all that you need. The main contribution here is to use a JIT with inline caches (Truffle VM) to optimize change propagation. That's some cool work, but it comes at a cost in flexibility and power, at least with the current state of the project. The framework supports only static graphs that only grow (no removing nodes), and changes must be single source (no "transactions" that handle several changes simultaneously). Those limitations are enough to make this probably not useful in "the real world." As a research project, though, using JIT w/ ICs to optimize propagation seems really promising.