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nixos-infect
[GPLv3+] install nixos over the existing OS in a DigitalOcean droplet (and others with minor modifications)
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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.
actually there is system-manager for managing a lot of system-level config including systemd stuff
You can execute nixos-rebuild on other distros but the NixOS modules and activation scripts expect it to run on NixOS system so it probably will not work (e.g. NixOS would want to control systemd, which would conflict with the distro). And if it did, you would no longer have the other distro but NixOS (see also nixos-infect).
home-manager allows managing user profile on other Linux distros
nix-darwin does similar thing for MacOS