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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
It lacks Vital and Surge, and since Vital was already linked, here's Surge: https://surge-synthesizer.github.io/
Cardinal is a fully open source re-distribution of parts of the standalone modular synthesis suite VCV Rack as a monolithic plugin. While still a relatively young project, it is one beast of modular synthesis. You can pipe midi, audio, and automation to and from the plugin as well allowing it to be used as a signal or midi processor, generator, sequencer, etc. The possibilities with this plugin are nearly endless. The learning curve is steep, but it is a full modular synth, so no surprises there. https://github.com/DISTRHO/Cardinal/releases