A nice way to add placeholders to input fields. "This module auto-converts form input fields with space-hogging labels into compact mobile-friendly input fields, with placeholders that animate into much smaller labels the moment text is keyed in. "

When a user visits a page that doesn't exist, they are shown search results instead of the standard 404 page. Integrates with Solr and many other modules.

If you haven't tried this module, try it now. It makes the modules page not suck.

"Associate menus, views, blocks, etc. with different contexts to structure your site."

This lets you define sections of your sites. Each section is called a context. Each context can be defined in many ways. A context may combine anything from a content type being viewed, a view being shown, a certain role is viewing the site, and much more. You can then do all sorts of things based on the context; things like theme switching, enabling

"This is a basic Views style plugin that allows for a limit on the number of rows displayed within a grouping field"

https

"Maxlength allows you to set maximum length of any field on any form making use of the form API. This includes fields created using the UI. (Example: any text field on a node)

"Geofield is a module for storing geographic data in Drupal 7. It supports all geo-types (points, lines, polygons, multitypes etc.)"

"This is a very simple module that adds a 'weight' field to the tables already used by the excellent Flag module. This weight can then be used to provide ordering of flagged items. This module also provides a Views field which can be used to sort flagged items. One interesting use of this ability is to integrate with Draggable Views to create a user-sortable list of flagged items"

Dramatically speeds up 404 handling. As of this writing, there is a bug when using drush. See this issue for a patch: https://drupal.org/node/2114479 . Thanks to Dan Shumaker for this tip.