Synestia

Being a patron of Brian Clevinger/Rhizomatic and a huge fan of Absynth and the more recent Plasmonic synth, as soon as Synestia was released I took it quite seriously, and this advanced multi effects processor immediately became one of my favorites of its class.

Synestia features a physical modelling synth engine that does interesting sympathetic sounds against input sources, it works well as a creative guitar effect, and it features a large palate of effects including granular processing, tuned effects, triggered MIDI effects, etc, and Synestia sounds good.

I have a few older synths, such as a microKORG XL, and putting Synestia on that channel really breathes new life into more classic synth sounds. For guitar, too, Synestia shines brightly in a sea of average plugins designed for similar purposes, and is worth the price. If you watch, Brian puts this on sale 1x or 2x/year and you can get it for around 70 USD.