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Uses

Things I use.

Hardware

I don't care too much about hardware, so this is a rather short list.

Medion AKOYA E4253
My laptop and only computer. It's a rather cheap one, but fully sufficient for my modest needs.

Software

In general, I prefer tools which are leightweight and fast and do one thing well. If I have to choose between two tools for a job, I will opt for the one which is more lightweight, has fewer dependencies, or which (being an OpenBSD user, see below) is part of OpenBSD base.

OpenBSD
After having used various Linux distributions for many years, I feel like I have finally found my (close to) perfect operating system. It is small, clean and simple, and perfectly suits my needs. It just feels right.
nvi
I was a Vim user for many years, but recently Vim started to feel too bloated to me. Therefore, I switched to nvi and never looked back since then. It turns out that many features I once thought were indispensable are in fact very easy to live without. For instance, read this if you think you can't do without syntax highlighting (as I did), and this if you think it is a drawback that (n)vi lacks all the features Vim has to offer (read it even if you don't). The only thing I really miss is Unicode support, which is why I have to revert to nvi-iconv instead of being able to use the default version, vi(1), from OpenBSD base.
cwm
I have used many different window managers in the past, most recently xmonad, which I was quite fond of (not the least because it is written in Haskell). cwm(1) is part of OpenBSD base, and I didn't even know it before I switched to OpenBSD. Finally a window manager which is simple, minimalistic, effective and unobtrusive.
ksh
I spend a lot of time in the terminal, and OpenBSD's default shell ksh(1) delivers everything I need. Part of OpenBSD base.
tmux
Since I spend a lot of time in the terminal, a terminal multiplexer is a must, and tmux(1) is the obvious choice. Part of OpenBSD base.
MuPDF
A fast and lightweight viewer for PDF files with vi-like keybindigs.
feh
A fast and lightweight image viewer.
FFplay
I rarely need a media player, but if I do, I will use FFplay from the FFmpeg multimedia framework.
Asciidoctor
Asciidoctor is a very fast text processor for the AsciiDoc markup language written in Ruby. It has great documentation and can directly generate PDF as output. I haven't used traditional text processors in a long time, mainly for two reasons: First, there is no separation of form and content whatsoever, which implies that content written in some text processor is always bound inextricably to the text processor itself. And second, they are much too complex and bloated for my taste, and in almost every case employ a GUI. Having used LaTeX a lot during my studies of physics – doubtless the best markup language and typesetting system for mathematical documentation –, it was also my first choice for creating other forms of documentation (like letters) for a long time. LaTeX is not really lighweight though, and while it is practically indispensible for creating mathematical and physical documentation, it is overkill for my typical purposes these days. Therefore, I have come to use AsciiDoc in most situations, which involves little markup at all.