There are various useful dictionary tools, like Dickinson's College Latin Core Vocabulary, which gives you the top 1000 Latin words (not sure what corpus they're using, but I assume it's one that's quite substantial).
However, I'm working through specific texts and would find it very useful to be able to plug in a body of text and get a list of unique words, sorted by frequency. Ideally it would be a "Latin aware" and group a single word together, regardless of inflection--but this would be quite complex and I suspect such a tool does not exist.
WordCounter.net will give you the top 100 unique words in the "keyword" panel, but appears to have a hard limit (you can enter a keyword limit of any number, but it only gives you the top 100).
Is there a freely available web tool that you can provide a block of text, and it will give you a list of unique words, with frequency of each word, and that you can sort by frequency (so I can start by reviewing the most frequently used words in the list). Dealing with repeated words (e.g., different inflections of the same word) is something I'll simply have to deal with.