If you want to step (deeper) into modular synthesis, Omri Cohen is one of the best teachers for that on YouTube. If you should not know, VCV Rack is a free software version for modular synthesis and there’s an iOS port available called MiRack.
Surge Synth Team updated the Surge synthesizer plugin (VST3) to v1.7.0 with hundreds of new features and a brand new user interface design.
Surge is free a versatile hybrid virtual synthesizer in the VST3 plugin format for digital audio workstations on Windows, macOS, and Linux.
Voltage Modular Nucleus 2 is right now freely available at Plugin Boutique. This collection of 22 modules and 176 presets is the ultimate introduction to modular synthesis.
Native Instruments offer a ton of sounds (2000) and instruments (Synths, Smaples Instruments) plus an organizer app (Komplete Kontrol) for free. Download here.
This is a free collection of 22 modules and 67 presets for Cherry Audio modular software. Limited offer!
And another free modular synth featuring:
– High Quality Oscillators
– Ultra Low CPU
– Intergrated 128 Note Polyphonic Modules
– Sample Player
– Karplus-Strong Physical Moddeling
– Analog Modelled K35 ZDF Sallen-Key Filter
– Over 40 Modules Available
– 1000s of Combinations
– MIDI Controller Enabled
– Unlimited load and save patches
– Single Microsoft Windows 32bit DLL