Quad9 - Quad9 is a free, recursive, anycast DNS platform that provides end users robust security protections, high-performance, and privacy.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
NextDNS - Block ads, trackers and malicious websites on all your devices.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
OpenDNS - OpenDNS provides faster and safer Internet access for your home or Business.
iTerm2 - A terminal emulator for macOS that does amazing things.