Jared Harbour

Ever want to change the url used to display your posts? This plugin 
allows a blog administrator to change a users url slug from their edit profile page.
The plugin allows for the creation of new author slugs, but also saves old slugs a user has used in the past.

Plugin Name:       Modify Author URL

Allows administrators to modify a users author url from their profile page.

sungraizfaryad

Remove Taxonomy URL strips the base slug (<code>/genre/</code>, <code>/topic/</code>, etc.) from your custom taxonomy term URLs so visitors and search engines see clean, short permalinks.
What 3.0 adds:
<ul>
<li>301 redirect old URLs — old <code>/taxonomy/term/</code> URLs redirect permanently to the new <code>/term/</code> URL so SEO equity is preserved when you turn the plugin on.</li>
<li>Hierarchical term URLs — nested taxonomies resolve correctly. <code>/parent/child/</code> reaches the child term instead of returning 404.</li>
<li>Pagination support — <code>/term/page/2/</code> works after the base slug is removed, no more pagination 404s.</li>
<li>Slug-collision detection — warns you (without blocking the save) when a term slug clashes with a page, post, or another taxonomy’s term, so you don’t accidentally break a URL.</li>
<li>Health Check tab — run a full audit of all selected taxonomies on demand.</li>
</ul>
All 3.0 features default to OFF on upgrade so your existing site behavior is preserved until you opt in.

Remove Taxonomy URL

Strip custom taxonomy slugs from URLs. Optional 301 redirects, hierarchical terms, pagination support, and slug-collision detection.

Plugin Name: Modify Author URL vs Remove Taxonomy URL