A free Microsoft Excel VBA application that can be used to check Google for keyword ranking and to track search engine rankings for various keywords over time. Uses Google API and API Web Service.

Allows access to the API via a REST-like interface, with results returned in XML.

Search tool which shows Google results arranged 100 per page. Also has an image search which displays images full size, and a choice of news headlines from a variety of sources.

Takes two search terms and shows which one is the most popular according to Google. Implementation using PHP with source code available.

This software, that won the 2002 Google Programming Contest, allows Google users to find web pages that are located within a specific geographic locale. Source code is distributed under the GNU GPL.

Tool for comparing the search results of Google and Yahoo in the same page.

Monitors professional interests online. Tracks the web for topics and sends new Google results by daily email. Not affiliated with Google.

Facilitates searching of all Google servers simultaneously. Includes additional options for German speakers. Requires frames.

Checks Google servers to determine if there is an update in progress.

Designed to help webmasters determine when Google is spidering the internet. Offers Google Web API help as well.