BlauKraut Engineering is an independent audio software developer founded by Dominique Wurtz. The company designs virtual instruments and effects plugins distributed in VST3 and CLAP formats for Windows and Linux.

Its flagship product is Charlatan, a free virtual analog synthesizer built around two dual oscillators per voice with drawable waveforms, cross-modulation, windowed hard sync, and a noise generator. The instrument offers two filters per voice — including 4-pole ladder LP/HP/BP, Acid LP, 2-pole Sallen-Key, Notch, and Comb types — with serial, parallel, and dual routing options. Its sound engine is optimized for low CPU use, making it suited for projects that load many synth instances. BlauKraut also develops bkFX, an audio effect plugin.

Charlatan has earned a reputation in the freeware plugin community as a capable "bread and butter" subtractive synth, and BlauKraut Engineering's releases are regularly covered by sites such as KVR Audio, Bedroom Producers Blog, and Rekkerd.

BlauKraut Engineering has 2 products cataloged on Equipboard, including Synth Plugins.