Monitter is web app that let you monitor words/hashtags on Twitter in real-time. What’s special about Monitter is the simple interface which is divided into columns and you can increase or decrease the number of columns as the number of words you are monitoring.
You have Monitter in your website as a web widget. Very useful!
Pros & Cons
|Very simple interface|
|Ability to search based on location range|
|No need for Twitter login|