Comparator 

Comparator will finds, deletes and copies over duplicate files, it will also find missing files and perform full backup routines. It can easily sync the files to ensure a perfect match. And here, too, is an alternative to the Microsoft Briefcase.
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Accelerweb 

Welcome to Accelerweb! Accelerweb is the latest in simple Internet acceleration technology. Accelerweb caches DNS settings to the hosts file. Accelerweb will store IP address/domain information in a local cache called the "Hosts" file.
accelerweb acceleration internet dns hosts host domain ip cache internet explorer simple technology easy background