PuTTY - Popular free terminal application. Mostly used as an SSH client.
CasterSoundboard - A soundboard for hot-keying and playing back sounds. (For podcasting)
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
JN Soundboard - An open-source hotkey soundboard program
iTerm2 - A terminal emulator for macOS that does amazing things.
Soundplant - Play sound files with the computer keyboard