IndeXTension

Creates an index of words and phrases

With IndeXTension, you tag the items that you want to index. The tagging of index entries is accomplished by either selecting the text to be indexed and pressing a simple key command. Entries can also be tagged with catagories. When tagging entries with a catagory, you group index entries.
An common example of this is found at the back of almost every cookbook where recipies that use chicken are indexed under Chicken. When you are ready to index your document, select an empty text box and use the Generate Index command.

The preferences allow you to control the look of the final index.

Working in combination with ex RTF Filter you can import Index tags from Word.