ksh topic
angel-PS1
Your fancy shell prompt fed by your guardian angel
polyglot
Color, ASCII-only Git prompt for zsh, bash, ksh93, mksh, pdksh, oksh, dash, yash, busybox ash, and osh
shellspec
A full-featured BDD unit testing framework for bash, ksh, zsh, dash and all POSIX shells
getoptions
An elegant option/argument parser for shell scripts (full support for bash and all POSIX shells)
modernish
Modernish is a library for writing robust, portable, readable, and powerful programs for POSIX-based shells and utilities.
xeon
module loader for bash scripts with `require` style
oksh
Portable OpenBSD ksh, based on the Public Domain Korn Shell (pdksh).