Ed Along with rlwrap it gives me a very fast and powerful workflow.
Rlwrap It wraps around a program and gives it the ability to make use ofthe readline lib.
Screen I use it when I boot without X. Gives a very fast workflow, being able to switch between programs.
Mpv Multimedia powerhouse. Even works (pretty) well without X, with a framebuffer.
Ecasound Cli daw. Have several scripts to make a recording on the fly or to be able to jam.
Thanks!