Network Sniffer that provides an overview of DNS queries sent on your system.
Simple application that allows you to modify your Windows HOSTS file.

Utility that configures your internet connection to get the best possible performance.
Free tool that allows you to quickly find open TCP and UDP ports on a system.
Lightweight tool for DNS optimization, designed to enhance internet browsing, speed up response times, and increase online privacy.
Utility with several tools for tests related to internet connection.