Is there any existing TLD for esperanto websites, or any plan for creating one?
Wiki states that
epo is the ISO code for esperanto language, so it could be used as the de facto TLD.
.epo could work, and there is precedent with other language-specific TLDs such as .cat (for the Catalan language). It was backed by a non-profit promoting the use of the language, so in theory something like the UEA could suggest and back a .epo TLD.... funds permitting of course.