PuTTY - Popular free terminal application. Mostly used as an SSH client.
Domain-Monitor.io - Looking for the complete domain and website uptime monitoring solution? Domain Monitor keeps an eye on your website, cron, SSL and domain name 24/7 and will alert you through Email, SMS and web when something stops working.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
DomainMOD - DomainMOD is an open source application written in PHP & MySQL used to manage your domains and other internet assets.
JuiceSSH - The all in one terminal client for Android including SSH, Local Shell, Mosh and Telnet support.
Tough Domains - Tough Domains is platform that provides tools to manage internet domains, domain insights, and domain monetization.