I saw a few posts discuss using the Wiktionary dump directly vs. the freeDictionary API, which is difficult to do because the raw wiki text isn't immediately usable. I actually created and open sourced a project several years ago that I never publicized that lexes and parses the Wiktionary dump: https://github.com/vthommeret/glossterm Specifically it can understand and execute 21 different wiki text templates (e.g. "…
I'm working on similar dictionary app and found wiktionary insanely usable as dictionary source.
Here is one more project aiming to make wiktionary data usable as json data structure: https://github.com/tatuylonen/wiktextract.
It has a link to a site https://kaikki.org/ which hosts dictionary data dumps.