1- GTMetrics:GTMetrics Quickly becoming one of my favorite tools to analyze and test page speed online. With GTMetrix, you can check Google Page Speed and Yahoo YSlow score of any web site. This information is very useful, especially since page loading time is one of many factors used by Google to determine rankings. When checking your site or any other site on GTMetrics, you are given a grade (ideal would be A). If your website page loading time is more than four seconds, or have a low Page Speed/YSlow grade (C or lower), it may mean that your site requires some tweaking. GTmetrix will provide detailed explanations of what is wrong with your site and what you can do to improve it. This information is very helpful to correct all the flaws in your current WordPress theme.
2- SEO Doctor:A FireFox Addon, it is a great “flyby” and simple tool, made with both beginners and experienced SEOs in mind. It’s scoring system and recommendations are based on official SEO documents, namely Google Webmaster guidelines, Google Image guidelines and Google SEO starter guide as well as Vladimir Prelovac’s (developer) own experience.
Main features of SEO Doctor are:
Points out to potential problems and assigns a score for your pages based on currently accepted SEO methodology
Shows link structure and helps track page rank flow for your pages
Detects and warns you about pages not indexable by search engines using most comprehensive methods available in any tool
One-click access to most popular SEO tools allows you to additionally inspect a site