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The E-mail Formatter module is a field formatter for the Email field (in Drupal
8 core) to allow email field addresses to be:

• rendered with mailto: links
• truncated to a specified number of characters for rendering, and if
  truncated then ended with an ellipsis (…)
• preceded by
  • custom text
  • custom HTML
  • an appropriate Font Awesome icon, which can also be rendered as a mailto: link to the address

View Entity Reference Field Formatter

This (small) Module allows you to use a view to display an entity or entities for an entity_reference field display.

Prevent Node Delete module is built to prevent & restrict the Node deletion when the Node is associated with nodes or used in entities using entity reference.

The Arithmetic Operation(mathoperation) module adds a new field type containing the two text fields wherein the operands can be entered and the total value calculated based on the inputs and arithm

This module adds a new field type to Drupal with optional pattern validation to match Personal Identification Code (PIC) format.

I'm a maintainer of the Leaflet Widget module.