The Surge Synth Team has updated Surge (formerly Vember Audio Surge) to version 1.7.0.
Surge 1.7.0 is a major enhancement to the synth with hundreds of changes, new features, new FX, new Oscillator features, many bug fixes, new patches, new modulation options, and a large collection of UI enhancements, including a dark skin.
It is available at: surge-synthesizer.github.io
You can read the changelog at: surge-synthesizer.github.io/changelog
Surge is Free and Open Source software, released under GPL3.