PuTTY - Popular free terminal application. Mostly used as an SSH client.
f.lux - f. lux is a piece of software for Windows, Mac, Linux, iOS, and Android that provides a blue light filter over your screen. Research suggests limiting our exposure to blue light in the hours before bedtime can help us fall asleep faster.
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
CareUEyes - CareUEyes is an eye protection software for windows that comes with blue light filter, screen dimmer, and break reminder
iTerm2 - A terminal emulator for macOS that does amazing things.
LightBulb - Background application that adjusts screen gamma, making the colors appear warmer at night...