- `entity_browser`: Doesn't do much without configuration. `media_entity_browser` is basically a configured version of this for browsing images, videos, etc. Might be better to do manually as it can integrate with `inline_entity_form`
- `contact_storage`: Aims to bring Drupal's core contact form module towards D7's `webform` and `entityform` modules
- `restui`: Useful when using the REST API to exposed endpoints, but can be done in `views` instead.
- `webform`: Look to replace with core's `contact_form` when it has features like multi-page support, email / handlers (user selectable, ideal for CRM), etc.
- `inline_entity_form`: For creating and editing entities on the same page.