E-H's overdrive pedal uses MOSFETs as non-linear elements to create distortion, and actually performs as well as many boutique pedals despite being very modestly priced.
It’s easy to pigeonhole spring reverbs as guitar amp accessories, but back in the pre-digital era, AKG built a no-holds studio spring reverb system called the BX20.
Siren Audio launched the Lorelei suite of applications a few years ago but now two of them, Generative and Feedback 2 have received major tweaks and updates.
Ogre’s Tubeholic pedal overdrive contains neither tubes nor, as far as I can tell, any alcohol. It does, however, feature 440g of barking-mad cast metal as its case.
While an overdrive pedal might not seem like an obvious studio accessory I’ve often found that using an analogue overdrive pedal before a software modelling amp/speaker produces more musical results.