What are the differences between OpenBSD and Linux?

This list is aimed at people who are used to Linux and are curious about OpenBSD. This cannot be understated: many people are attracted to OpenBSD in the first place because it’s much more minimal than Linux and even FreeBSD. Let’s jump to some of the not-so-nice ramifications of OpenBSD’s philosophy:

Most closed-source Linux software does not work: skype, slack, etc.

Source: cfenollosa.com