Following are tools I use a lot, but am not necessarily loving... There is a separate post for those.

environment

• Debian: my favorite OS
• Android, for nearly all my mobile needs
• Firefox (on Debian and on Android)
• fish: has a superior command completion system, and overall better usability
• Zellij: pleasant terminal multiplexer
• Alacritty

info/comms

• Zulip (used both by work and by the Rust project)
• Mastodon (primarily via Phanpy)

software development

• Helix: acts as a decent IDE, and is a fantastic text editor
• Rust toolchain
• Git: hard to avoid
• Radicle: peer-to-peer GitHub alternative

GUI applications

• AntennaPod: for listening to podcasts (on Android)
• Transmission: the only torrent client I ever used
• VLC: user interface could be a lot better
• NewPipe: alternative viewer for YouTube (on Android)
• Nemo: a fork of Nautilus
• nm-applet: part of NetworkManager

network diagnosis

• vnstat: nifty network usage viewer
• ping: checks general reachability
• mtr: interactive traceroute tool

miscellaneous tools

• apt: Debian package management
• tail: included in GNU coreutils suite of tools
• fd-find: a more pleasant find
• Sudo
• ripgrep: a more pleasant grep
• eza: a more pleasant, more pretty ls
• bat: a more pleasant, more fancy cat, which also supplants less (though it actually makes use of the latter for paging through long text)
• top: a powerful and flexible process viewer, part of procps suite
• bottom: an alternative to top (only on work machine)
• mdBook: lightweight documentation system, using it to serve a number of books (with mdbook serve)
• Zola: for this blog, and served with zola serve
• Difftastic, alone or with Git