Discontinued Planck EZ Keyboard by Erez Zukerman https://blog.zsa.io/2307-goodbye-planck-ez/

Sammlerstueck! Planck EZ Tastatur

Specifications

Key Switches: Cherry MX Brown/Blue, Kailh Gold/Thick Gold, Silver, Copper
Layout: Compact, 47-Key, Ortholinear, QWERTY
Backlit: Per-key RGB (optional)
Keycaps: Tai-Hao, Double Shot
Programmable: Yes, Firmware-level programming (multi-layer support)
Open Source: Yes
Cable: USB-C to USB-C (Type-C to Type-A adapter included), 80cm
Additional Features: Built-in sound chip turns your keyboard into a musical keyboard