Webmaster tool for calculating the PR of a web site. Includes description of how PageRank works and related links.

Online graphic PR calculator.

Browser extension that displays the Google Pagerank in the browser's status bar (Firefox and Mozilla only).

Uses a given amount of terms to select a 'random' page from the index.

Generates random search queries for a user-defined number of search terms. The PHP source code is available.

An ad-free Google search proxy which prevents the searcher's data being stored by Google, a Firefox plugin, and tools for webmasters.

A PageRank and backlinks tool that parses the Google XML report of a URL for values that are different from the toolbar, with source code.

Tool to show the effects of filters are on the algorithmic results returned by the Google API. Personal white and blacklist capability.

Online SEO tool for monitoring Google's crawl rate. Offers both free service, and pay for service.

Shows the Google results with their PageRank.