by Toro_Unit (Hiroshi Urabe) on WordPress.org
Add archive page for "Post".
If the permalink is “/archives/%post_id%” or “/post/%postname%” or “/news/%post_id%” …. , Create archive page “/archives/” or “/post/” or “/news/”.
The plugin automatically redirects users who have accessed a blog post link without the category to the one which has the category and therefore avoid …
This simple plugin creates a category widget that allows you select the category to display
Norman Advanced Archive Widget is a free replacement for the standard WordPress archive widget. Lots of customization options to satisfy your needs.