Fieldtypes that start with the letter T, run on ExpressionEngine 2, are compatible with Low Variables and are sorted alphabetically by Title.
Taggable is an easy-to use, powerful and advanced tag module/add-on designed exclusively for ExpressionEngine 2.1. Compatible, flexible and sophisticated.
A custom fieldtype for ExpressionEngine that creates a checkbox tree or drop-down menu for one or more Taxonomy trees. Selected items are added as Playa relationships.
Template Select is a port of Tim Kelty's Template Select for ExpressionEngine 1.6. It allows you to select a template from within your publish field for embedding into the template. It is great for including a simple template within an entry, but combine it with Matrix, and you can create a page building interface for your clients.
NOTE: This is add-on is no longer being supported and will not be updated for EE3. Fork it if you like.
ExpressionEngine 2, ExpressionEngine 3, ExpressionEngine 4
Time Select is fieldtype that offers a configurable dropdown menu of times - perfect for use in an events channel.