Comparing BSD and Linux
▻https://www.freebsd.org/doc/en_US.ISO8859-1/articles/explaining-bsd/comparing-bsd-and-linux.html

So what is really the difference between, say, Debian Linux and FreeBSD ? For the average user, the difference is surprisingly small : Both are UNIX® like operating systems. Both are developed by non-commercial projects (this does not apply to many other Linux distributions, of course). In the following section, we will look at BSD and compare it to Linux. The description applies most closely to FreeBSD, which accounts for an estimated 80% of the BSD installations, but the differences from NetBSD, OpenBSD and DragonFlyBSD are small.