Here are a few small plugins I've built. Each plugin attempts to do one thing, and one thing only.

Additional JS

This plugin adds an “Additional JS” input to the customizer. This allows Javascript to be added to a site without needing to edit the theme or create a child theme.

Disable Administration Email Verification Prompt

WordPress 5.3 introduced a feature to periodically prompt administrators to verify the site’s administration email address. This plugin disables that prompt.