Termux yeah. I use it everyday. So here is a (long) list

• Use ffmpeg to convert videos or even edit it(with current 6.x version, mediacoded hwaccel is availiable)

• yt-dlp

• Use vim and emacs, maybe code something

• Integrate it with other plugin apps like Termux:API(lots of system apis), Termux:Boot, Termux:Float(floating terminal), Termux:Widget, even Termux:X11 For running gui apps

• You can run gui apps with other X servers like XSDL

• Compile and run programs that is not availiable for arm(Worst thing, but i still does it. Much hassle and error prone, but fine for smaller programs)

• Use ssh to connect to other devices

• Install x11-repo and thus install xfce and firefox desktop(for fun)

• Install proot-distro and use distros like debian, arch, ubuntu, manjaro, void, fedora, etc. which is cli only by default but you can install any DE.(You can combine display server from XSDL)

• Use git, clone a repo, make changes, use it or push commit, whatever you do with git

• Use your normal standard linux commands to browse thru your filesystem and make changes

• neofetch, cpufetch, rxfetch, htop, gotop, cmatrix and hollywood for lolz

• tmux, byobu or gnu screen

• Tar, gzip and all coreutils

• cryptomining(DON'T do that)

• Test your webpage locally (php -S localhost:port)

Ahem I wasted a lot of time making this list i think i have to go now lol