We would regard the 'tools' a bit wider than plugins only. Here are some thoughts from a developer point of view
5 free tools of our choice:
- HTML5 boilerplate by Paul Irish http://html5boilerplate.com/ and HTML5 WP theme http://wordpress.org/themes/boilerplate
- Skeleton responsive boilerplate http://www.getskeleton.com/
- Types plugin http://wp-types.com/
- Better WP-security plugin http://wordpress.org/plugins/better-wp-security/
- w3 Total Cache plugin
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