Some Wordpress plugins are often updated, which is good think. Plugins that are updated are 100% compatible with last Wordpress version and they also are the most secure possible. A plugin that has not been updated for a long time might not work with last Wordpress version and might create a security breach for you website.
Simple plugin that checks your WordPress install and shows your file permissions, size, and last modified date.
This plugin is designed to send an email notification whenever a draft is saved.
A simple Javascript writing/editing tool using ACE editor and the Minify library
This plugin gives you the ability to set Meta Keywords in WordPress. Under pages it will registrate a separate taxonomy for keywords.
The JetMails plugin allows you to easily setup a subscribe form for your list.
Apollo Bar is a simple announcements plugin that allows you to create colorful notification bars for your website.
Custom 404, creates a 404 page that is set to the default one of your WordPress installation. This page is fully customizable from the dashboard.