highimpacttech

This plugin adds .html (or any extension) to your WordPress page and category urls.
You can change the extension from Plugin Setting page.

Custom category and page extensions

Add any ".extension" to WordPress category and page urls.

Eric Mann

READ THE FAQ BEFORE UPGRADING TO VERSION 1.1!!!
You can add a special link through which users can register and have a particular user level/role applied by default.
Need to separate people into multiple categories? Now you can automate the filtering process and save yourself time.

RegLevel

Set an alternate registration URL for a subset of users who need a different role on registration.

Custom category and page extensions vs RegLevel