Fliqlo Screensaver - A screensaver that displays the time using a flip clock.
PuTTY - Popular free terminal application. Mostly used as an SSH client.
Padbury Clock Screensaver - Minimal screensaver for Mac
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
Xscreensaver for Windows - XScreenSaverWin is a Windows port of XScreenSaver. 204 screensavers in XScreenSaver were ported.
iTerm2 - A terminal emulator for macOS that does amazing things.