C Class Backlink Analyzer - This tool investigates the links pointing to a website (backlinks), and groups them according to the C-Class IP addresses they come from. For example, if one backlink comes from 53.25.14.5 and another comes from 53.25.14.6, they would be grouped together. Backlinks coming from the same C-Class IP are most likely hosted by the same company, which may lower the site's search engine ranking.

Cache.it - This tool analize your website and provide you with wide range of statistics.

Celebrity Ranker - This tool analyzes the web pages in Google's database to find out what the Internet thinks about any celebrity.

Check Yahoo WebRank - Find out the Yahoo WebRank of your and your competitors websites. This tool help you evaluate the importance of a URL as perceived by Yahoo.

Class C Checker - This tool will allow you to check if 2 domains are hosted on the same Class C IP range. What's the use of that? Well, links from sites that are not on the same class C IP range as your site are thought to give more weight.

Class C Checker - This 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.

Class C Range Checker - Convert web addresses into IP Addresses with the Text Link Brokers Class-C IP Checker. Also calculates number of unique IP's and unique "Class-C's".

Combine Words - Use this tool to create combinations of keywords for use in a Google AdWords or Yahoo! Search Marketing Pay Per Click PPC campaign.

Compare Any 5 URLs - This tool allow you to compare up to five different URL's.

Compare URL - This tool allow you to compare up to ten different URL's.

Cool Cache Tool - This tool is to check whether URL(s) have been cached by Google and the date they were cached. You can use this tool to check 1 URL and ALL the INTERNAL links found on that URL or use the text input box to check a number of different URL's.

Cool SEO Tool - This tool check it all: Yahoo! page rank, MSN page rank, Pages Indexed (google/yahoo), Backlinks, Allinanchor rank, Domain Age, Phrase count.

CPM calculator - This calculator measures the ROI (return on investment) of a CPM (cost per thousand) impressions advertising model, such as many banner and button buys.

CSS Validation Service - a free service that checks Cascading Style Sheets (CSS) in (X)HTML documents or standalone for conformance to W3C recommendations.

CSS Validator - This tool is checks Cascading Style Sheets (CSS).

CSS Validators - This tool is checks Cascading Style Sheets (CSS).