
Bitterspring 4 Band Shifter
Platform/format: PC/VST Download
An open-source offering that "can scale (shift) independently the pitch of four adjacent, user-definable frequency bands". As well as pitch shifting knobs, each band also has one to adjust its volume, while you can set the bands' end points (and, consequently, start points) too.

MZK Media Technologies Distortion M Plus
Platform/format: PC/VST Download
This is a multiband distortion plug-in that enables you to apply different amounts of distortion to different frequency zones. It can also be used just as an EQ section and, by combining the standard and multiband distortions, as a dual-stage effect.

WOK Xphaser LE
Platform/format: PC/VST Download
This one features two phasers, each of which has a slightly different sound. The two can be routed in series or parallel, and each has panorama and volume controls. This is a free version of the full Xphaser, which adds host sync and manual sweep features and costs €11.

The Chip Collection SabaTwoTiga VST
Platform/format: PC/VST Download
Synths don't get much simpler than this one. Tones can be selected with a 4-voice knob, 2-way switches are used to modify the sound and you get basic filter controls. SabaTwoTiga is said to be suitable for creating "powerful electronic leads" and is described as "beefy and musical".