Also check out Zsh Navigation Tools and Zsh Command Architect

Incremental history word completing (started with Alt-h/H or Option-h/H on Mac):

Swapping, copying, deleting shell words, also undo:

Add zinit load zdharma-continuum/zsh-editing-workbench to .zshrc. The config files will be available in ~/.config/zew.

Add zgen load zdharma-continuum/zsh-editing-workbench to .zshrc and issue a zgen reset (this assumes that there is a proper zgen save construct in .zshrc). The config files will be available in ~/.config/zew.

Add antigen bundle zdharma-continuum/zsh-editing-workbench to .zshrc. There also should be antigen apply. The config files will be in ~/.config/znt.

After extracting ZEW to {some-directory} add following two lines to ~/.zshrc:

fpath+=( {some-directory} )
source "{some-directory}/zsh-editing-workbench.plugin.zsh"

As you can see, no plugin manager is needed to use the *.plugin.zsh file. The above two lines of code are all that almost all plugin managers do. In fact, what's actually needed is only:

source "{some-directory}/zsh-editing-workbench.plugin.zsh"

because ZEW detects if it is used by any plugin manager and can handle $fpath update by itself.

Organized shortcuts for various command line editing operations, plus new operations (e.g. incremental history word completion).

XTerm

To make Alt key work like expected under XTerm add XTerm*metaSendsEscape: true to your resource file, e.g.:

echo 'XTerm*metaSendsEscape: true' >> ~/.Xresources