I use vim (text editor), curl (download from internet (many protocols) and can be piped; can also send), xclip (command-line clipboard access by pipes), dc (calculation), grep, 7z (supports many file formats), and the SQLite command shell. I also use less, bash, gcc, gdb, valgrind, dosbox, Ghostscript, and many others. I also wrote my own programs for some things; for example, I have my own set of programs for dealing with picture files (Farbfeld Utilities), but I also have ImageMagick in case of something that Farbfeld Utilities does not currently do; I have made programs for other things too. (Of course, I use many other programs too.) (Unfortunately, some of them use Unicode even though I do not want them to (others do not have that problem), and sometimes requires writing extra code to work around them (other times I am working only with ASCII and it is not a problem).)