@heikkiket i suggest debian, just note that they might be dropping support for i386 in the future: https://www.phoronix.com/news/Debian-Plans-Cease-i386
but debian has a stable release schedule, so the current stable version (bookworm) will be supported until 2026, and then it will have long term support until 2028 so you don't really have to worry about it
@heikkiket A debian one, like Bunsenlabs. It's light and speedy, running it on an old Netbook with 1Gb ram and an old 150Gb hdd. It's an oldie Acer Aspire One.
https://www.bunsenlabs.org/installation.html
And you could try your hands on multibooting it with FREEBSD and or OpenBSD. I got it multibooting with LMDE (Linuxmint debian), Peppermint, Bunsenlabs and FreeBSD.