If you love quotes, then having an app that allows you to find quotes about any topic under the sun is a must have. Here are some of the most popular:

The Quotes: Daily Inspiration & Wisdom with Lock Screen Wallpapers for iPhone is free and displays quotes with a variety of backgrounds so you can save them as wallpaper and on your lockscreen. 

The Quotes for Facebook iPhone app is $0.99 has has 40 categories and 3000+ quotes for you to choose from that you can quickly share with Facebook, text, or tweet to your friends and followers.

The Quotes+ for iPhone app is also $0.99 and allows you to share your favorite quotes on Twitter, Facebook, and Tumblr. There is a random quotes feature or you can search by author, category, or quote.

The 23,000 Great Quotes app is free and has 23,000 quotes to read through, search through and share on Facebook, Twitter, Email, or can be copied to clipboard.