Some of my favorite Reaktor Blocks:
Combine those (and others) with the various MIDI Out Blocks to be found in the User Library, or route audio to Expert Sleepers modules for CV Out, and you can integrate with pretty much anything outside of Reaktor.
While BEAP does provide higher level abstractions in Max, I'd say that Reaktor Blocks are higher level yet. Abstractions that leave the realm of "audio" and enter the realm of "musical". That can be a blessing and possibly a curse. It's a blessing if you want to quickly wire some blocks together eurorack style. Potentially a curse if you want to create a new kind of block and you don't like Reaktor's low level way of working. For myself, I generally find it to be well thought out, with a few frustrating restrictions here and there. Those restrictions are intended to be helpful standardizations most of the time, but sometimes it does feel overconstrained.