OpenRC, an alternative to systemd
wiki.manjaro.org
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TrueOS (PC-BSD successor) recently switched to it (https://www.trueos.org/handbook/postinstall.html#use-of-open...) citing much faster boot times due to parallel launching.
As discussed at https://news.ycombinator.com/item?id=13451924 .
Further to https://news.ycombinator.com/item?id=13458186 , there still hasn't been a response.