This is a listing by composer, but some items that were under "composers" (like "Bésard") actually belong under "sources", because they are anthologies or compilations The intention is to gradually pare down the contents of this directory and post as much as possible under "sources". Once the database is up and running, you will be able to search by composer (or any other parameters).
These are complete fronimo editions of sources, with midi and PDF versions of each.
These are facsimiles, arranged by source (composer, editor, anthologist, or library), document (book or ms), and volume (if more than one volume). They are further broken out by folio or page number, so you can go directly to the location within the document or volume that you want to see.
These are files in the TAB format, where possible, or midi format where not possible.
Spreadsheet
This is an Excel spreadsheet with a comprehensive list of all the fronimo files on the website. It should reflect the approximate current state of the data.
It also contains hyperlinks to fronimo, midi, and pdf files for each entry.
For each piece listed, it has 26 fields that contain other data, such as key, type of piece, instrumentation, source, and difficulty.
If you can read this file, that is probably the easiest way of finding things. If you don't have a spreadsheet program installed on your computed, you can obtain a free one from "LibreOffice".
LibreOffice does what MS Office does, with just a few differences, and it can open MSOffice files.