Peter Wooster

This plugin allows administrators to view the names of code files changed after a given time or within a time range. 
This can be useful for:
<ul>
<li>detecting changes made by malware</li>
<li>change management for developers and project managers</li>
<li>running a preliminary scan before using a file monitoring system like “WordPress File Monitor Plus”</li>
</ul>

Simple Changed Files

A very simple plugin that displays the names of files changed after a given time or within a time range.

Siteguard

Siteguard Security plugin logs and displays failed login, error and exception to help you, with detailed information, to supervise what happens on your site.
We think this plugin help you monitor your site to have knowledge of what happens on your site. If you know what happens you can take the proper actions to avoid security problems and, most important, know if this actions are effective.

Siteguard Security

Logs and displays failed login, error and exception to help you, with detailed information, to supervise what happens on your site.

Simple Changed Files vs Siteguard Security