PuTTY - Popular free terminal application. Mostly used as an SSH client.
Giphy - Search all the gifs and make your own animated gif
MobaXterm - Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more
GIPHY Says - Turn your words into animated GIFs!
iTerm2 - A terminal emulator for macOS that does amazing things.
Drop to GIF - Super simple movie to GIF conversion