MMDeveloper

A wordpress plugin that allows you to easily create your error log file and view your wordpress errors. Once a day it will shift your log file into a logs directory under root and datestamp it. This keeps the error files small and easier to manage.
Built by The Marketing Mix Perth: http://www.marketingmix.com.au

View WP Error Log

Alex King

Crowd Favorite

If you’ve decided to move things around on your site, you might overlook a few redirects and end up with some broken URLs. This will help you catch those so you can take care of them.

404 Notifier

Log 404 (file not found) errors on your site and get them delivered to you via e-mail or RSS.

View WP Error Log vs 404 Notifier