Provides a field formatter that can attempt multiple formatters and the first one that returns output wins.

This module exposes a formatter that prints one image from a multi-value image field. It will allow the same options as the original image formatter plus the possibility of choosing which image to print. Selection must be made using a positive integer where 1 will print delta 0. If the selected image image number doesn't exist, a random one will be chosen.

This is a small module written to provide a custom formatter for taxonomy items. The default formatters both output the terms wrapped in divs. This module adds a new formatter that allows you to specify the element type, the wrapper type, classes for both, the separator used, and if they link to the term pages or not. This gives much more customizable layout options.

Fuzzy Date

This module provides date and time fields that allows any individual component to be left blank, while still providing a sortable listing of the fields. Useful if you need to handle dates like "8:46 a.m Sep 11, 2001 EST", "12 noon 25 May, Early 16th Century" or "May 20000 BC" in the one field.

By my rough count, there are 150 contrib projects for Drupal 7 that declare new field types as part of their central module. I've listed the projects here by their usage statistics.