Minimally maintained

This module allows one field to track changes over a given time span in another field based on revisions. For example, if field A records the number of kittens you own, and field B is set to find the difference of field A over a 1 month span, field B would show how many new kittens you acquired in the past month. The difference is calculated whenever the entity is saved.

Currently, only nodes seem to have revisions, so it only works with nodes. So far this only does integer differences. If you'd like it to do something else, open a feature request issue.

Poll Extras provides additional flexibility to the core poll module. Here's the specifics:

Drush Downsync
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Move one environment's database and files directory to another.

This script currently relies on Drush* and Drush's site alias features. And now
that it's using drush_invoke() instead of drush_shell_exec(), you do not need
a 'files' key in your site alias. core-rsync has a %files path, so as long as
your remote site is reporting that path correctly, this should be able to grab
your remote files.

The taxonomy node order module allows you to order the nodes associated with a term by affecting a weight to each node.

This weight will be added to the default sorts criteria of Drupal (date of creation, sticky node).
By activating the module a new tab appears on the term page. By clicking on the tab you get the list of nodes associated with the term, you can then order by drag and drop.

A button lets you return to the default sorting.

The simplepapiphp_auth module makes it possible for Drupal to support PAPI for
authentication of users. The module will auto-provision user accounts into
Drupal.

The problem using Drupal book module and book pages as wiki is, the book page module adds book outline form part and the book outline menu as node/x/outline to all node types. All the node types do not need to be part of a book/wiki page. So this is the awkward part. I had to develop an application that had a wiki as a part with blogs and events as other services.

TestDrupalWinCache

403 and 404 pages should not be dead ends for site visitors. This module replaces the 403 and 404 pages and adds functionality to help a visitor access proper content. The 403 is augmented by a login form. The 404 is augmented by a search form and suggested pages.

This module is inspired by this article, this module and this module.

This module provides a live preview for some Entity Reference widgets. To use it, create an entity reference field, set it to use an autocomplete widget (the normal one, NOT the tags-style one) or a select widget, and in the field instance settings, enable the live preview and select a view mode (e.g. teaser) to use. Now when you select an entity to reference, you should see a preview of the referenced entity in the selected view mode.

Drupal 7 and Ubercart 3 Freightquote (freightquote.com) shipping calculations.