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Several years ago I did a manual for a product called XCase, which was
supposedly better than ERWin but much less popular. I don't know if
it's sold any more.
If you document a lot of database programs, then learning how to use any
CASE tool is beneficial. Using such tools, you learn about efficient
database design and get a good feel for the terminology and software
issues. Who knows, you might even be transformed into a programmer!