Lets sites talk to each other. REST.

This modules provides a widget called Multiple Selects list for reference and list types fields.

Compact Forms presents text fields for selected forms in a more compact fashion using jQuery.

This is a great API that many other modules use. Here is the info from the project page that summarizes it well: "The Field API in Drupal core lacks the ability for other modules to easily alter field formatter settings forms and the formatter summaries. This module is a small API provider for other modules since it's too late to get the hooks into core..."

The description at Drupal.org describes this module the best:"This module creates separate "Edit account" and "Edit profile" tabs for each user, with custom user fields configured under "Edit profile."

Gives a site owner options to disable specific messages shown to end users.

This module will geocode just about anything you throw at it including addresses, GPX files, geo-tagged images, and KML files.

Provides integration with the geoPHP library

"IP Geolocation Views & Maps (IPGV&M) makes it easy to create Views-based mapping solutions using the map renderer of your choice (Google, OpenLayers or Leaflet)..."

"Provides Animated Marker Clustering functionality for Leaflet"