MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.
iTerm2 - A terminal emulator for macOS that does amazing things.
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.