1. Contact Form 7
You can easily manage multiple contact forms, plus you can customize the form and the mail contents flexibly with simple markup. The form supports Ajax-powered submitting, CAPTCHA, Akismet spam filtering and so on.
2. Yoast SEO
Improve your WordPress SEO: Write better content and have a fully optimized WordPress site using the Yoast SEO plugin.
3. Slider Revolution Responsive WordPress Plugin
Slider Revolution (Revolution Slider) is an innovative, responsive WordPress Slider Plugin that displays your content the beautiful way. Whether it’s a Slider, Carousel, Hero Scene or even a whole Front Page, the visual, drag & drop editor will let you tell your own stories in no time!
4. Jetpack by WordPress.com
The one plugin you need for stats, related posts, search engine optimization, social sharing, protection, backups, speed, and email list management.
5. W3 Total Cache
Search Engine (SEO) & Performance Optimization (WPO) via caching. Integrated caching: CDN, Minify, Page, Object, Fragment, Database support.
6. All in One SEO Pack
The original WordPress SEO plugin, downloaded over 45,000,000 times since 2007.
7. WP Super Cache
A very fast caching engine for WordPress that produces static html files.
8. WooCommerce
WooCommerce is a powerful, extendable eCommerce plugin that helps you sell anything. Beautifully.
9. Facebook Like Box
Displays a Facebook Like Box. The Like Box is a social plugin that enables Facebook Page owners to attract and gain Likes from their own website.
10. Google Analytics for WordPress by MonsterInsights
The best Google Analytics plugin for WordPress. See how visitors find and use your website, so you can keep them coming back.