Bitlbee does wonders for inter-communicating with people.

Also, mocp and mpv as audio/video players. Youtube-dl works with mpv.

Config:

    cat ~/.config/mpv/config

    sws-fast=yes
    sws-allow-zimg=no
    #zimg-dither=no
    vd-lavc-skiploopfilter=all
    video-unscaled=yes
    ytdl-format=bestvideo[height<=?420] [fps<=?30]+bestaudio/best

More lightweight tools:

    - Mupdf for cbz/PDF/epub files.
    - ImageMagick/Xpaint for image creation/modification.
    - Sxiv as the image/gif viewer.
    - Sc-im/visidata for spreadsheets.
    - Groff+ms||groff+mom/Ted for documents. By "groff" I mean eqn/tbl and so on.
    - Gnuplot for graphs, or grap from troff/groff.
    - Already said, but swirc+bitlbee. Get the libpurple build of bitlbee, you'll get lots of supported protocols with that build. Yes, telegram-purple does work.