“environments”

WordPress plugin that allows you to switch between different environments from the admin bar

Easily switch between hosting environments in WordPress.

Keep your ACF field groups synchronized between different environments

Frame Core is like normalize.css for your WordPress site. In addition to setting sensible defaults, there's dev helpers and things that assist with working across multiple environments.

Non Production Robots Ignore is a simple WordPress plugin that is used with vlucas/phpdotenv (or similar) that sets environment variables to set robots.txt to ignore all on all environments except production.