Programs: shell libraries
Bash doesn't exactly have libraries per se, but there are some bash-front ends to libraries (like curses) that allow you to interact with them from shellscripts.
dialog (shell) bash interface for the curses library bash-oo-framework OOP, exceptions, etc in bash tput get info from the termcap db
jq parse json yq parse yaml tomlq parse toml dasel parse json, yaml, toml, xml, csv. no external deps. csvsql SQL queries to CSV files