K1v is a free classic rompler that emulates the famous japanese classic Kawai K1 from 1988.
U-He has updated its freeware Zebralette virtual synthesizer with a brand new GUI and support for macOS Big Sur.
Zebralette is a free virtual synthesizer based on an oscillator from U-He’s famous Zebra2 synthesizer.
Fury 800 (KORG Poly 800 Emu) has been updated recently to V2.0.1. It’s completly free from Full Bucket Music (Donations possible).
Free chaotic monosynth by Newfangled Audio. Pendulate uses a brand new oscillator design to produce sounds different from any other synth. Download from Eventide site.