The ultimate note taking app. Sync notes, pictures and voice memos automatically between your computer (Mac or PC), read your notes in the browser and share them with friends. Make sure you pair this with Evernote's web clipper for your browser of choice. You can also upgrade to the premium version for some added features, but I get along just fine with the amazing free version.
Social networking meets navigation and they fall in love. Their love child is Waze, a great Navigation app that just keeps getting better as more people join. With every new user the apps becomes more and more useful as users update others with notifications regarding traffic, construction and other hazards, all to help each other get places faster.
There is a reason that Facebook paid around a billion dollars for the company that made this app. The app is the perfect social network of sharing photos. Built in filters make it fun and easy to bring out the photographer in all of us.
Google Search App
This app has been around for years, since the early days of the iPhone. However, Google just did a major overhaul and this app went from being just "ok" to replacing Safari on my home screen. Search Google by typing or voice search to find out what you need to know in seconds.
The ultimate RSS, social network, Tumblr, Twitter and News reading and sharing service…on any platform. Even better than anything you can use on your computer. This was true before but is even more so now, since they added full Google+ integration.
I'm going to be honest. It absolutely pains me to put this app on this list. If it wasn't for the fact that Facebook is an integral part of our lives at this point, it would not be anywhere near this list. But Facebook is, so it is on this list. With that being said, I hate this app. It is glitchy, slow and notifications work only when they feel like it…but alas, it's on my home screen and I use it constantly. If you can talk you're friends and family into using it, Google+'s app is a far superior user experience and an absolute delight to use.
While I strongly prefer Tapbot's Tweetbot Twitter client, as I feel it is one of the best apps ever made for the iPhone, Twitter's official twitter client is actual pretty good if you can't stomach the $2.99 price tag for Tweetbot.
The ultimate finance app. Takes some work to setup (use Mint.com to do this) then it syncs down to your phone. Keep track of budgets, spending, income and the works all with this amazing free service.
While not perfect, Facebook's official Messenger App works well and makes you wonder how a company that came up with this could also have come up with the official Facebook App (where the chat feature is slow and glitchy). I mean, the notifications actual work on this app. It's simple and a great addition for those that spend even an average amount of time on Facebook chat.
Are you a sports fan? Do you have favorite teams that you want news and updates on? Then get this app. End of story. It's that good!
While I prefer the paid version because it gets rid of the ads, this app is awesome at checking in on the score of any game you need to know about. Push alerts update you real time on everything from the final score, score changes and even close games, all customizable of course.
Kindle for iPhone
There are several good iPhone reading apps and while iBooks and the Nook app are good, my personal favorite is the Kindle app. Now, part of this is that currently the Kindle is my eReader of choice, but I also use iBooks on my iPad, so in my opinion the Kindle app just feels faster than the others. But you really can't go wrong with any of them and should get the one that matches your eReader of choice.
*Note: I included no games on this list and the list is in no particular order
So that is my list of must have free apps. What free apps did I miss that you feel are must have?