MarcusPope

A WordPress plugin that converts all URL formats to root-relative URLs to enable seamless transitioning between staging/production host environments and debugging/testing from mobile devices, without the use of hackish tactics like textual find-replace strategies or risky hosts/NAT spoofing strategies.
With Root Relative URLs you can browse your development site from http://localhost/ or http://127.0.0.1/ or from a named network resource like http://mycomputername/ without worrying about links redirecting you back to your site’s URL.
This plugin also modifies the tinyMCE hooks so links and media embedded with built-in tools will only insert URLs from the first forward slash after the domain (i.e. the root of your site.) This means when you push content changes to a staging or production environment they are guaranteed to reference the correct target instead of accidentally referencing a production resource in development or, worse-yet, a development-exclusive resource in production.
It supports path-based MU Installations, but does not support domain-based MU sites due to architectural deficiencies in the WordPress core.
Version 1.5 fixes an infinite redirect problem that is a result of a core bug in WordPress. If you have problems with the <!–more–> tag or permalinks for custom post types, please read the FAQ or new Install Steps for support.
Version 2.2 allows for adding certain URL’s or partial URL’s to a blacklist, meaning I won’t use root relative urls, but dynamic absolute URLs instead for displaying content. This will fix problems with 3rd party plugins, and can be configured on the General Settings page.
<h3>Arbitrary section</h3>

Root Relative URLs

Converts all URLs to root-relative URLs for hosting the same site on multiple IPs, easier production migration and better mobile device testing.

Julio Potier

Grégory Viguier

SecuPress

superment

<h4>Move Your Login Page</h4>
Tired of bots finding your WordPress login page? SP Move Login allows you to change your login URL to protect it from automated attacks and brute force attempts.
This plugin contains the Move Login module from <a href="https://secupress.me/" rel="nofollow ugc">SecuPress</a>, a comprehensive WordPress security plugin. While this plugin focuses solely on moving your login page, the full SecuPress version includes many other security features such as:
Why move your login page?
By default, WordPress login pages are located at <code>/wp-login.php</code> and <code>/wp-admin/</code>, making them easy targets for bots and attackers. SP Move Login allows you to:
<ul>
<li>Change your login URL to a custom slug</li>
<li>Protect your registration page (if enabled)</li>
<li>Block access to the default login pages</li>
<li>Display custom error messages or redirect to a custom page when someone tries to access the old login URL</li>
</ul>
Features:
<ul>
<li>Simple and easy to use</li>
<li>Change your login URL with just a few clicks</li>
<li>Works with pretty permalinks</li>
<li>Compatible with multisite installations (includes Single Sign-On support)</li>
<li>Custom error messages for blocked access</li>
<li>Redirect to custom page option</li>
<li>Lightweight – focused solely on moving your login page</li>
</ul>
Note: This plugin requires pretty permalinks to be enabled. You can activate them in Settings > Permalinks.
For more advanced security features, check out the <a href="https://secupress.me/" rel="nofollow ugc">full SecuPress version</a>.

SP Move Login

Don't know why I didn't find "Move Login" first. I already tested 2 alternative free plugins and it was deficient in different ways.  "Move Login" is powerful, light and easy to set up. Very nice find. Thanks.

The best of the 3 ones I tested

Move your WordPress login page to protect it from bots. This plugin contains the Move Login module from SecuPress. Other security modules are availabl …

Root Relative URLs vs SP Move Login