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InfluxDB
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Box64 and https://github.com/FEX-Emu/FEX are the projects to look out for. QEMU is made to emulate an entire system with hardware interrupts and everything. Userspace solutions like these and Apple's Rosetta have many corners they can cut because they're much further away from actual hardware requirements.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.