Developer tools

Webform is easy to use and has a bit of flexibility right out of the box. Though it's seriously lacking in the accessibility department especially in Drupal 7.

Simple Lazyloader is a module, which provides integration of jQuery Lazyloader (https://github.com/tuupola/jquery_lazyload) w

Drupal 8 module that enables the Whoops! error handler when encountering catchable errors.

Cache Buster for Drupal

This is a fairly simple module, that does a great great job.
It removes the query string from CSS files, by converting them all to external

This module provides uploading different logos for (sub)domains created using the Domain module.

Module provides interesting option to give the users help information for each Webform field.