I've just released version 0.4.0 of reactor.nim. It contains substantial performance improvements and multicore support (i.e. running multiple threads, each with its own event loop, possibly communicating).
There is also very very basic support for MTCP/DPKD userspace networking stack, for the cases when kernel TCP support is too slow. 0.5.0 will hopefully use the same Future implementation as stdlib (and maybe more).
