Term Merger is a  plugin that merges multiple terms (categories, tags, custom categories, custom tags) into one term (category, tag, custom category, custom, tag). If you want to merge multiple terms into new single term then Term Merger provides the functionality to create a new term and merge multiple terms into the new

WP Self Sort is a powerful plugin sorting the order of posts, categories, tags, custom post types, users and plugin list by using a Drag and Drop with JQuery UI Sortable. The order can be customized within the default WordPress post type and custom post type’s list page. It allows to reordering the posts and categories