Asciinema : Asciinema is a free and open source solution for recording the terminal sessions and sharing them on the web.
tmate : Tmate is a fork of tmux. It provides an instant pairing / sharing solution for the terminal.
warp : Secure and simple terminal sharing
warp lets you securely share your terminal with one simple command: warp open. When connected to your warp, clients...
present : A terminal-based presentation tool with colors and effects.
You can also play a codio (pre-recorded code block) on a slide.
Shariff : Shariff enables website users to share their favorite content without compromising their privacy.
ASCII.IO is the simplest way to record your terminal and share the recordings with your fellow geeks. Simply record and upload your terminal session with a single command, and ASCII.IO will play it back in your browser.