- explainshell.com - match command-line arguments to their help text
- Shellcheck finds bugs in your shell scripts. Available as an online tool and a installable CLI tool. Written in Haskell.
- modernish/modernish: cross-platform POSIX shell feature detection and language extension library
- Oilshell – Why create a new Unix Shell. See “A glimpse of Oil” – (statically parsed, lossless syntax tree, stricter runtime behaviour.. etc.,)
- Software development using Bash – illustrates the use of