Dither

ZynAddSubFX free software-synthesizer by paulnasca 2

Dither is a free dither VST plugin developed by mda. Compatible OS(s): Windows, macOS.

Apply all the standard dither types with fine adjustment of dither level and noise noise shaping, and a “zoom” function for auditioning the result.

http://www.mda-vst.com/

4L2

4L2 free limiter | dither by Signaldust

4L2 is a free limiter and dither VST plugin developed by Signaldust. Compatible OS(s): Windows.

This limiter is not necessarily transparent, but it’s relatively clean anyway. It might not be the ideal master limiter, but the short look-ahead makes it usable for live situations. It comes with dual metering (peak and RMS) and integrated dither.

http://www.signaldust.com