RackTables - Racktables is a nifty and robust solution for datacenter and server room asset management.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
DCImanager - DCImanager is a platform for managing physical equipment. Connect any physical equipment to a single platform. Use the platform to manage your servers, switches, PDU as well as physical and virtual networks.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Opendcim - a free, web based Data Center Infrastructure Management application.
iTerm2 - A terminal emulator for macOS that does amazing things.