I’ve created [this yomitan dictionary](https://gitlab.com/johngavingraham/yomitan-rtk), which gives kanji -> keyword lookup for the Remembering The Kanji (6th ed.) keywords, which I’m finding very useful. It accidentally also does keyword -> kanji over English text.
I couldn’t find anything like this before but I’m sure if I missed it then one of you will let me know 🙂
by Slight_Sugar_3363