Server Status recommends the following free plugins:
- Speed Demon Install now!
A powerful bundle of lightweight tweaks that drastically improve the loading speed of WordPress by reducing bloat and improving overall efficiency. - Custom Functions Install now!
Enables the ability to input custom WordPress functions such as filters in a centralized place to avoid the dependence on a theme functions.php file. - Maintenance Mode Install now!
Minimalistic plugin with a simple one-click on/off switch and zero settings to worry about, featuring default WordPress styling without any images. - Virtual Robots.txt Install now!
Replaces the default virtual robots.txt generated by WordPress with an editable one, and deletes any physical robots.txt file that may already exist. - Google Analytics Install now!
Inserts Google Analytics code just above the closing body tag to ensure fastest performance possible and to avoid conflicting with any other scripts.