The library and librarian mentioned by Mike are in the email received after purchasing FF, trying to sell you more stuff.

Filter Library Backup is a collection of all the 10,000+ filters from our online filter library in a single ZIP file (29.95 USD)
Filter Forge Librarian is an auxiliary program that allows you to view the filters inside the Filter Library Backup and select specific filters to be installed into Filter Forge. Note that Librarian won't work if you haven't purchased a Library Backup (39.95 USD).

Here is what FF has to say about these:
There are 11125 filters available in the online filter library. Though you can freely download them from the website, we also offer an archive of all library filters at a specific date in a single file – a convenient way to load all filters at once into your copy of Filter Forge.

Filter Library Backup without Librarian
If you choose to get a Filter Library Backup without Librarian you will receive a ZIP archive of all library filters. You will need to unpack it and copy its contents to the folder that stores filters on your computer. This option doesn't allow you to select specific filters for import, so you will end up with over 10,000 filters loaded into your Filter Forge. Since there are no caches in the ZIP archive, Filter Forge may take a bit longer to start while processing the newly-added filters.

Filter Library Backup with Librarian (Windows) Recommended option
The recommended option is a package containing Filter Library Backup with Librarian – an interactive filter browser that simplifies import of filters into Filter Forge. It allows you to preview filters and select specific filters to be installed into Filter Forge. Librarian will automate filter installation (you won't need to copy any files manually); it also generates filter caches for Filter Forge. Librarian is a standalone program that is installed separately and doesn't run simultaneously with Filter Forge.