Audio-to-cv converter: Control CV with volume or generate Attack Hold Decay with incoming transients.
https://www.reasonstudios.com/shop/rack ... dio-to-cv/
Morphor CV Utility: Hook up to 8 synth parameters or the volume of 8 synths, snap shot and morph. It has x/y cv-inputs for morphing so, you can automate it with lfos or seqs.
https://www.reasonstudios.com/shop/rack ... v-utility/
Check out rest if the developer's stuff as well: https://www.reasonstudios.com/shop/brow ... %20Control
Then we have the Enlightenspeed stuff, including a Note humanizer for loosening quantification of drums and instruments.
https://www.reasonstudios.com/shop/brow ... peed%20Ltd
and Tonicmint's stuff: https://www.reasonstudios.com/shop/brow ... =Tonicmint
Finally, Reason's own modular synth, Complex, is a closed system and does not offer connectivity with other modules. Strange choice, imo. However, Blamsoft's Viking 2 is modular too and has lots of connectivity if that is what you look for.
