Termux yeah. I use it everyday. So here is a (long) list
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Use ffmpeg to convert videos or even edit it(with current 6.x version, mediacoded hwaccel is availiable)
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yt-dlp
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Use vim and emacs, maybe code something
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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
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You can run gui apps with other X servers like XSDL
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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)
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Use ssh to connect to other devices
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Install x11-repo and thus install xfce and firefox desktop(for fun)
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Install
proot-distroand 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
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Use your normal standard linux commands to browse thru your filesystem and make changes
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neofetch, cpufetch, rxfetch, htop, gotop, cmatrix and hollywood for lolz
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tmux, byobu or gnu screen
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Tar, gzip and all coreutils
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cryptomining(DON'T do that)
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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