http://wordpress.org/extend/plugins/options-framework/ - The Options Framework Plugin makes it easy to include an options panel in any WordPress theme. It was built so developers can concentrate on making the actual theme rather than spending time creating an options panel from scratch.
Pods Framework - Pods is a framework for WordPress that allows you to create, extend, manage, and deploy customized content types and fields.
NHP-Theme-Options-Framework - Simple, easy to use, very extendable Options framework for WP themes.
Redux-Framework a fork of NHP-Theme-Options-Framework.
WordPress + Memcached One of the most bizarre critiques of WordPress that I often hear is “it doesn’t come with caching” – which makes no sense because Cache is one of the best features of WordPress out of the box
NGinx plugins: - https://www.nginx.com/resources/wiki/start/topics/recipes/wordpress/ (en bas de page)
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WP App Studio's plugins (free & not free).