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CLK
A latency-hating emulator of: the Acorn Electron and Archimedes, Amstrad CPC, Apple II/II+/IIe and early Macintosh, Atari 2600 and ST, ColecoVision, Enterprise 64/128, Commodore Vic-20 and Amiga, MSX 1/2, Oric 1/Atmos, early PC compatibles, Sega Master System, Sinclair ZX80/81 and ZX Spectrum.
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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.
I'm afraid I can't be that helpful as to emulator suggestions, or I'd just have done that up front. I use the emulator I write myself, which I make available for Linux via SDL or Qt but is best-supported on the Mac. Though even then it's probably not as good as a whole bunch of other options. But a quick barrage of links: Mac binaries, Qt Snapcraft (i.e. Ubuntu app store, amongst others), repository.
Alas I'm a Windows dunce. I really know nothing about it. The Windows emulators I've see mentioned recently in the sort of emulator circles I frequent are Retro Virtual Machine and ZeSarUX but both of them are quite different from my ideal image of an emulator, having non-standard UIs and being very upfront about being products of their own. In my ideal world an emulator would just make my computer Spectrum compatible, so all my Spectrum software sits in my applications folder, or on my dock, or wherever else I launch software from, and clicking it launches it just like clicking on any other piece of software.