Freeware - Green Oak Software Tungsten, Cesium, Crystal VST Plugins

https://greenoak.com/effects/

Delay effect with a twist. Tungsten is a sound design tool to add ambience with texture and color. Use it to create heavenly echoes, dense reflections, or mysterious drones.

Cesium brings distinctive character to a chorus effect, producing sounds that range from luscious stereoizing to exotic flanging to bizarre spatial effects. Use it to add motion and depth to your sound.

One of the most popular virtual instruments of all time, Crystal is available as a plugin for computers and as an app for the iPad and iPhone.