Julio Potier

Grégory Viguier

SecuPress

This plugin forbids access to https://example.com/wp-login.php and creates new urls, like https://example.com/login or https://example.com/logout. 
This is a great way to limit bots trying to brute-force your login (trying to guess your login and password). Of course, the new URLs are easier to remember too.
Also remember: the use of this plugin does NOT exempt you to use a strong password. Moreover, never use “admin” as login, this is the first attempt for bots.
By the way, if you are looking for a complete security solution, take a look at <a href="https://wordpress.org/plugins/secupress/" rel="ugc">SecuPress</a>: Move Login is included inside.
<h4>Multisite</h4>
Yes! The plugin must be activated from your network. 
Note 1: this plugin deals only with <code>wp-login.php</code>, not with <code>wp-signup.php</code> nor with <code>wp-activate.php</code> (yet). That means https://example.com/register will still redirect to https://example.com/wp-signup.php. I think this will be the next step though, but no ETA. 
Note 2: if users/sites registrations are open, you shouldn’t use this plugin yet. There are some places where the log in address is hard coded and not filterable. A <a href="https://core.trac.wordpress.org/ticket/31495" title="Always use 'login' as $scheme parameter for "login-ish" URLs, and other inconsistencies" rel="nofollow ugc">bug ticket</a> is open.
<h4>Requirements</h4>
<ul>
<li>You will need a FTP access: if the <code>.htaccess</code>/<code>web.config</code> file is not writable (you will need to add the given rules manually), or if something is wrong and you can’t log in anymore (see the FAQ in that case).</li>
<li>Should work on IIS7+ servers but not tested (I guess you should probably save a copy of your <code>web.config</code> file before the plugin activation).</li>
<li>For Nginx servers, the rewrite rules are not written automatically of course, but they are provided as information in the plugin settings page.</li>
</ul>

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

Change your login URL for something like https://example.com/login and stop login brute-force attempts.

parswp

<h4>A must have plugin for wordpress blogs</h4>
By using Hide Login+ you can simply change most important URLs that are being accessed every day, keeping them safe and secret.
For those upgrading from previous version: please check installation steps
New features:
<ul>
<li>No need to modify <code>wp-config.php</code> any more (see installation steps)</li>
<li><code>.htaccess</code> backup file is created before changes take effect (named <code>.htaccess.backup</code>)</li>
<li>Recoded to be latest WordPress version compatible</li>
</ul>
Benefits:
<ul>
<li>Have secured and hidden login page</li>
<li>Customized URLs for the most important parts of your WordPress installation</li>
<li>Control access over <code>wp-login.php</code> and <code>wp-admin</code> pages</li>
<li>Easy back-to-defaults ability without frustration</li>
</ul>
Features:
<ul>
<li>Define custom URL slug for login, logout, registration, lost password & admin pages</li>
<li>Able to prevent access to <code>wp-login.php</code> and <code>wp-admin</code> directly</li>
<li>See your <code>.htaccess</code> content after changes have been successfully updated.</li>
<li>
Revert to default configurations on plugin deactivation (or easily via a second method)
This won’t secure your website perfectly, but if someone does manage to crack your password, it can make it difficult for them to find where to actually login. This also prevents any bots that are used for malicious intents from accessing your <code>wp-login.php</code> file and attempting to break in.
</li>
</ul>

Hide Login+

Have a secure login and admin page. Allows you to create custom URLs for user's Log in, Log out, Sign up and Admin page.

Move Login vs Hide Login+