The best part of the iTunes App Store is that you don’t need to spend a single cent to fill your iPhone with amazing useful free iphone apps. There are tons of developers dishing out quality useful free iphone apps daily.

So in honor of cheapskates everywhere, this article features 100 Useful Free iPhone Apps. The apps are organized into ten categories: Social, Business, Productivity, Financial, Utilities, Mobile & Remote File Access, News & Weather, Travel, Food, and Audio & Video.

A few of these are free for a limited time only so be sure to act fast on these Useful Free iPhone Apps!

Useful Free iPhone Apps

Social

Twitter – Discover what’s happening right now, anywhere in the world with the official Twitter for iPhone app. Realtime search, Top Tweets, trending topics and maps show whats happening now everywhere and nearby. Tweet, send DMs, share photos, videos and links to your friends and the world. Don’t have an account? Just sign up from the app!

Facebook – Facebook for iPhone makes it easy to stay connected and share information with friends. Use your iPhone to start a conversation with Facebook Chat, check your friends’ latest photos and status updates, look up a phone number, or upload your own mobile photos to Facebook while on the go. In our opinion, one of the best Useful Free iPhone Apps.

Skype – With Skype on your iPhone or iPod touch you can call and instant message anyone else on Skype for free. You can also call landlines and mobiles and send SMS anywhere in the world, at great rates. Skype is free to download and easy to use. This makes our list as one of the absolute TOP Useful Free iPhone Apps!

Bump – Bump makes sharing with people quick and easy. Just pick what you want to send, then hold your phones and gently bump hands with another person using Bump. Share photos and contacts, compare friends, or become Facebook friends in seconds!

AIM (Free Edition) – Chat with your Facebook friends on AIM for iPhone, even if they’re not AIM users. To get started, just click Facebook Connect button at the top of the AIM Buddy List. Your Facebook friends and groups will be added to your Buddy List (with the Facebook icon next to their name). Now chatting with your Facebook friends is as easy as using AIM.

Foursquare – Foursquare helps you find new ways to explore your city. See where your friends are, learn about the places they frequent and unlock rewards as you travel through the city.

Friends Around Me – Friends Around Me is a free mobile app for interacting with friends 24/7 across social networks: check-in directly to Foursquare and share status on Twitter, Facebook. Meet new people nearby or across the world through an interactive location-based search.

LinkedIn – LinkedIn for iPhone puts your professional network just a touch away. Walk into any interview or client meeting with the ability to look up the details and connect with over 60 million professionals worldwide. Get the latest updates and messages from your network and keep them up-to-date with your status in real-time. Another “must use”  of the Useful Free iPhone Apps.

Messagey – ‘Messagey!’ is the ultimate free SMS app with super-fast load times and super-fast message sending, allowing you to send your messages, super-fast! It’s quick and convenient, since it brings an all new way of sending messages to the iPhone, with the introduction of our intuitive ‘Message Sliders’, allowing you to save commonly used messages – so they’re ready to send with just a few taps. Thus, another great addition to the Useful Free iPhone Apps list.

Fring – Fring is a multi-award winning mobile application that lets you make free voice calls, free video calls (one way) and live IM chats directly from your iPhone and iPod touch.

Useful Free iPhone Apps for Business

Dragon Dictation – Dragon Dictation is an easy-to-use voice recognition application powered by Dragon NaturallySpeaking that allows you to easily speak and instantly see your text or email messages. In fact, it’s up to five (5) times faster than typing on the keyboard. With Dragon Dictation you can also update your Facebook status, send notes and reminders to yourself, or Tweet to the world….all using your voice. Talk about a Useful Free iPhone Apps! So when you’re on-the-go, stop typing and start speaking – from short text messages to longer email messages, and anything in between.

See other great post for Useful Free iPhone Apps here.

This is invaluable. Thanks to appstorm.net for putting together the best list for useful free iPhone apps!