What's the best free open source chatbot therapist that runs on Linux?

eliza is in linux standard repositories, for example on ubuntu 20.04:

sudo apt-cache search eliza

sudo apt install -y libchatbot-eliza-perl

dpkg-query -L libchatbot-eliza-perl

/usr/share/doc/libchatbot-eliza-perl/examples/simple

Emacs doctor is very rudimentary but can be surprisingly useful.