Greenoak – Crystal 2.5.6 x64 x32 VST WiN OSX [free]

Crystal is a free semi-modular software synthesizer that combines subtractive synthesis with FM synthesis, giving you a flexible sound-design tool for both classic analog-style tones and more complex digital textures. It offers over 90 parameters that can be modulated, multi-stage envelopes with graphical editors, and extensive tempo sync for envelopes, LFOs, and delay times. Built-in effects include a band splitter that lets you process different frequency bands separately, and the synth also supports wave sequencing, granular synthesis, and program morphing. MIDI learn makes it easy to map hardware controllers, and you can import soundfonts to expand your palette. Crystal runs as a VST plugin on Windows and macOS in 64-bit (and 32-bit on Windows), making it compatible with FL Studio, Ableton Live, Logic Pro, and other DAWs. At around 23 MB, it is a lightweight addition to any setup. It suits hobby producers and sound designers who want a versatile, free synthesizer for experimenting with hybrid synthesis, modulation, and effects processing without a steep learning curve.