u-he Uhbik-F and Uhbik-P, $199 for a bundle of nine effects
Part of the ever-growing Uhbik collection, Uhbik-F and Uhbik-P are the set's flanger and phaser plug-ins respectively. The flanger models both tape-based and stompbox-style flangers and throws in a gorgeous chorus effect for good measure. The phaser is no slouch, either, providing a staggering 14, 28 or (gasp!) 42 stages.
d16 Group Fazortan, €35
Fazortan combines retro-style modulation effects with modern niceties such as dual LFOs, each with selectable waveforms. You can change the phase of each LFO, which results in a more dramatic stereo image. It's a fully professional design with loads of knobs. It might seem like overkill at first, but the sound is rich and inspiring – well worth the meagre asking price.
Schwa Oligarc, $60/$40
Coming from the makers of the intentionally cryptic Olga synthesiser, you'd expect Oligarc to be entirely over-the-top - and it is. Oligarc combines a filter and drive section with a chorus and a phaser and wraps 'em all around a kooky modulation section that converts the incoming audio signal into control signals that can drive the other effects.
Blue Cat Audio Chorus, Free
Looking very much as if it were inspired by Eventide Clockworks' 1970s effects, this terrific freebie comes in a wide variety of plug-in formats and provides a terrific-sounding chorus with a reserved but flexible smattering of controls. A random mode generates presets if you're not inclined to set them up yourself, and both mono and stereo versions are included.