Surge XT vs Zebra 3

Surge XT is a free, open-source virtual instrument plugin and hybrid synthesizer for making music. Each patch has two scenes that can be layered or split, and each scene has three oscillators with 12 algorithms, including wavetable, FM, string, and audio input. Its listed library includes over 2,800 patches and over 700 wavetables. Other features include 12 LFO units, flexible modulation routing, and 16 effect units with 27 algorithms. Performance support includes MPE, Scala and MTS-ESP microtuning, and Open Sound Control. Surge XT runs on Windows, macOS, and Linux, with plugin formats varying by platform: CLAP and VST3 on Windows; AU, CLAP, and VST3 on macOS; and CLAP, LV2, and VST3 on Linux. It primarily needs a DAW or another compatible host, though a standalone executable is available. Version 1.3.4 is identified as the stable release for normal production use. The software is licensed under GPL3.

Zebra 3 has no write-up on Specifiction yet; its figures are above.