renanivo

Adds some Multisite-specific functions to WordPress’ XML-RPC interface (http://yourdomain.com/xmlrpc.php).
Using this plugin, you can create a blog, update the archived status and get a blog ID using a remote software (another server, a desktop software, a mobile software…)
The functions enabled by this plugin are:
<ul>
<li>Create Blog (ms.CreateBlog)</li>
<li>Get Blog Id (ms.GetBlogId)</li>
<li>Update Archived (ms.UpdateArchived)</li>
</ul>
refer to the <a href="http://wiki.github.com/renanivo/WP-Multisite-XML-RPC/" rel="nofollow ugc">wiki</a> for further documentation

Multisite XML-RPC

Adds some Multisite-specific functions to WordPress' XML-RPC interface.

toxnico

Did you ever feel like your website or blog login page is ridiculously fragile and reachable, and could be easily broken in by an intruder?
Personally I hate to think of hundreds of people playing with my door lock hundreds of times a day. It’s the same with my blog login page.
On WordPress, there are two main potential vectors of bruteforce intrusion: 
* http://my-site.com/wp-login.php, which is the login page 
* http://my-site.com/xmlrpc.php, which is an API gateway for interacting with third party applications.
This plugin adds one security layer in front of your login page, and by the way you can also disable XML-RPC with a simple checkbox if you don’t need it (XML-RPC is a WIDELY used vector of attacks).
The idea is simple: you choose a pair of words, and when you want to access your login page, you just have to provide them in the URL like this: http://my-site.com/wp-login.php?word1=word2. That’s all! 
If you try to access your login page without this pair of words, you get a configurable error message, where you can insult the attacker as much as you want 😉

WP Login Door

This plugin is the easiest way to hide your login page and thus avoid brute force attacks



Simple and useful

Adds a secret URL key to access the login page and lets you disable XML-RPC, protecting against bruteforce attacks.

Multisite XML-RPC vs WP Login Door