Kitty terminal - Super fast, GPU and OpenGL based terminal emulator with tiling support
cheat - Cheat allows you to create and view interactive cheatsheets on the command-line.
WindTerm - WindTerm is a terminal emulator application that is used in cross-platforms such as SSH, Sftp, Shell, Telnet, and serial terminal and allows you to use the mouse to conduct any operation on its interface.
explainshell - Match command-line arguments to their help.
Tabby.sh - Tabby is a free and open source SSH, local and Telnet terminal with everything you'll ever need.
CheatKeys - View Windows keyboard shortcuts in the current application.