[r3dey3]

I've never tried any of the following, but have come across them:

* https://github.com/vitorbaptista/shellshare

* https://tmate.io/

* https://github.com/yudai/gotty - actually gives you a tty in a browser

* https://github.com/dtinth/ttycast

(edit: formatting)

[jheuel]

Even nicer because it does not need a third party server is https://github.com/maxmcd/webtty Communication is done using webrtc

[miguelmota]

tmate is awesome for pair programming

[giancarlostoro]

But it goes through a third party server instead of locally at least by default.