We are working on a major rewrite of the Felix tool, Felix architecture was quite chaotic and mostly hard to expand, so we created Flux.

Flux is a redesigned Felix. It is written in C++ and with a modular design. Still it is missing most of the features of felix and is only usable as a repeater over the UDP transport, so using felix is still necessary for live streaming and production environments, but we hope to be able to prefer Flux over Felix soon.