[auraham]

I am attached to Ubuntu because of apt, my development stack (python, numpy, scipy, matplotlib, and so on), and i3 as window manager. I would like to give it a try, but I am not sure if these applications are available in OpenBSD.

[basscomm]

Apt isn't available for OpenBSD, but the rest of the apps you listed are: https://cdn.openbsd.org/pub/OpenBSD/6.5/packages/amd64/