FRUJI – Professional Twitter Analytics
http://start.fruji.com/

FRUJI is a pretty simple yet powerful product. They analyze your followers and compile all the data into a couple of simple reports. Find out if any VIP (verified) accounts are following you, who your most popular followers are and much, much more. They do not tamper with your account in any way and only require read privileges (which you can always remove at any time through your Twitter account). A lot of services might ask for write permission or more, they recommend to avoid using these products. Compared to a lot of other services out there, they are working hard to ensure that they are staying within all policy limitations governed by Twitter. This means, sometimes their tools need a little more time to crawl through your data sets because they are limited by Twitter’s servers to a certain maximum speed here. Other services might disregard these limitations and find themselves blocked by Twitter sooner or later. This is what they are avoiding at all cost. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.