Who have Rhythmizer?

This is the first time I know it today. It feels amazing. But it seems to only support live ?

Yup, it is a Max4Live device (native to Ableton Live), per the product description on the developer’s site:

new Max4Live device

But a lot of its functionality (from what I can tell from the video) can be achieved with other (free) plugins, like for example… CodeFN42 - Free VST MIDI Plugins & More
Specifically, I use RandArp a lot.