Advanced Search Short Code (pippinsplugins.com) Advanced search forms are something almost every large site wants, especially since they make it dramatically easier to find content across the site. This is a simple plugin that provides a short code that displays an advanced search form on your site.
Wysija Newsletters Wysija is one of the most useful WordPress plugin for Newsletters. It comes with a free version and a premium one, having many interesting features like: visual editor, schedule newsletters, multiple lists and many themes, free or premium.
Soliloquy Soliloquy is a nice responsive jQuery slider plugin for WordPress. Easy to customize and use, it has nice features :AJAX, SEO, lightbox and more. It also allows you to have multiple sliders in you pages, posts, custom post types and widgets.