Web tools....
Alexa Rank Comparison

Google is making some changes on how automated search results are handled, and it is causing some of our tools to not operate correctly. We apologize for any inconviences this has caused, and we are working on ways to make our tools functional again.

Alexa Traffic Rank

The traffic rank is based on three months of aggregated historical traffic data from millions of Alexa Toolbar users and data obtained from other, diverse traffic data sources, and is a combined measure of page views and users (reach)

Broken Link Checker

Link checking algorithm has been improved and shouldn’t generate false warnings anymore. It is discovered to not work will be re-checked again a few minutes later. This is useful if the link only appeared to be broken due to a random network glitch or server overload.

C Class Checker
C  Class  Checker tool allows you to check if some sites are hosted on the same Class C IP Range. This Class C Checker may be used in these cases:

• You own several cross-linked sites: it may be more efficient (for SEO purposes) to host them on different Class C IP ranges
  
• You're going to get new links from different sites: check if they share the same class C IP range