
Description: iSEM Synthesizer is a free virtual instrument that emulates the iconic OB-X and OB-Xa analog synthesizers. It has 2 oscillators, 1 sub oscillator, 2 filters, 2 envelopes, an arpeggiator, and effects. Great for vintage synth sounds.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Surge Synthesizer is a free, open-source digital synthesizer plugin for music production. It features multiple wavetable, analog, and hybrid synth engines with effects, modulation options, an arpeggiator, and more for crafting sounds.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API