Create a list of non-hierarchical taxonomies and display it in your sidebar or footer, as an alternative to the tag cloud.
Update for WordPress 4.3 by removing PHP4-style widget constructor usage (https://make.wordpress.org/core/2015/07/02/deprecating-php4-style-constructors-in-wordpress-4-3/).
Update for WordPress 4.2 to handle term splitting in the plugin's include/exclude functionality. Details at https://make.wordpress.org/core/2015/02/16/taxonomy-term-splitting-in-4-2-a-developer-guide/.
Correct problem in WordPress 3.3 and higher that resulted in an empty taxonomy dropdown.
Remove all uses of PHP short tags.
Allow empty title in widget options. If empty, the taxonomy_list_widget_title filter isn't run.
Provide control over link relationship (dofollow and nofollow) in widget. This capability is still available via the taxonomy_list_widget_link_rel filter.
Fix fatal error in older WordPress versions resulting from PHP4 and PHP5 constructors existing in widget class.
Fix bug in post count threshold that resulted in no terms being listed.
Fix fatal error
Completely rewritten plugin to use WordPress' newer Widgets API.
Drop support for WordPress 2.7 and earlier.
Add support for all public, non-hierarchical custom taxonomies, in addition to Post Tags.
Introduce new, more flexible function for manually generating lists.
Fixed persistent bugs in the include/exclude functionality.