dSSH (Docker SSH) is a function made for ZSH. It simply autofills the command dssh (alias of docker exec -it xx /bin/bash) with the names of active containers. Just simply tab through the active containers!
First you need Oh-My-ZSH, then simply run curl https://raw.githubusercontent.com/innovato/dssh/master/dssh.txt >> ~/.zshrc and start a new instance of your terminal.
Just enter dssh <tab> <tab> and there you go!