I always add words to my LibreOffice dictionary (standard.dic), but I would love to make those words available to other users by contributing to the project's dictionaries. Is there a way LibreOffice can produce statistics about how often a word is added in dictionaries from users wishing to help? Or is there a project I can join to participate in the dictionaries editing?
The user dictionary is just for personal use. LibreOffice does not actually collect words for dictionaries, instead it just assembles existing ones. I think the best way for personal contributions is through Wiktionary from which maybe in the future additional dictionaries can be built.
The best way to add words to a dictionary, is to contact the author of the dictionary.
Check this site to see how: Dictionaries in LibreOffice.