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InfluxDB
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I actually have a project where I'm trying to collect provably open source classic CP/M software and integrate it into a turnkey build system, at https://github.com/davidgiven/cpmish/tree/master/third_party. There's some tools there you might find useful, such as a Basic, about three text editors, a good debugger, a shitty Z80 assembler which I wrote (I have yet to find a classic one with a license attached), and a copy of Star Trek. It's aimed at producing bootable disks but as you already have a working system you won't want that, but you should be able to just pull the .COM files out (file a bug and I'll try and make that easier).