1. i-nigma Reader – http://bit.ly/i-nigmaReader. This is one of the best at reading any code it scans.  I personally use this one the majority of the time. i-nigma Reader
2. Scan Life – http://bit.ly/scanlifeReader. This is one of the biggest. Scan Life is also great for the reporting features it offers.  Great for using if you are coordinating a big program. Scan Life Reader
3. Quick Mark Readers - http://bit.ly/QuickMarkReadersQuick Mark Readers
4. QR Stuff - http://bit.ly/QRstuff. Great if you want the QR Code in color!   QR Stuff Reader
5. Neo Reader - http://bit.ly/NeoReader Neo Reader
6. Kaywa- http://bit.ly/KaywaReaderKaywa Reader
7. Snap Maze - http://bit.ly/SnapMazeReaderalso allows you to choose a color; also has a firefox extension for creating instant QR codes from a urlSnap Maze Reader

I learned about the following two QR code generators after the ones above, but now use these in my personal marketing 90% of the time.

8. Beqrious - http://www.beqrious.com/generator This one enables you to put a picture (of yourself or an object) in the middle message to your short code.  Scan the code and watch it automatically appear in your phone, ready to text. Beqrious 

9. Sparq Code - http://www.sparqcode.com/static/maestro - Click on the "sms" tab and put in your text

Sparq Code

Here's an example of the above when using the "sms" tab.

Coach Dotti Berry's Mobile Card - Text and be entered to win a free FB business page.

Scan this QR code made with Sparq Code, automatically putting in "CoachB" to 90210 as shown above.