Note that all have different, sometimes incompatible license. In particular dictionaries from Taiwan's Ministry of Education usually don't allow derivatives.
There is also a lot of dictionaries digitized on Archive.org that felt into public domain would require transformation into text (actually the Jibiki project did that with the Cesselin).
Well Wordnet is often described as a combination of a dictionary and thesaurus structured so a computer can understand it https://wordnet.princeton.edu/
My dad's German Persian dictionary is freely available on https://farhang.im with source code on https://git.hmt.im/hmt/farhang-3
I haven't yet found the ideal way to share the sqlite database file in a current state.
I know about https://www.dicts.info/ (which itself is compilation of multiple sources, some open sourced by universities, some more shady)