Analytics and Tracking

SpyLogSpyLog

SpyLog Usage Statistics · Download List of All Websites using SpyLog

Provides analytic services for sites - Russian Based. Now known as OpenStat.

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GitHubGitHub

GitHub Usage Statistics · Download List of All Websites using GitHub

The website mentions github.com in some form.

Email Hosting Providers

SPFSPF

SPF Usage Statistics · Download List of All Websites using SPF

The Sender Policy Framework is an open standard specifying a technical method to prevent sender address forgery.