DxO FilmPack 3 Essential edition is free until October 31 courtesy of a Sony promotion.
http://www.dxo.com/intl/sonyDxO FilmPack emulates major films from Kodak, Fuji, etc. So if you've been missing that TriX 400 look, this film pack may be worth trying out.
DxO FilmPack is available for Windows and Mac, and works as a plugin for Aperture, Lightroom or Photoshop.
The newer DxO FilmPack 4 is also available at a discount from the same link.
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Thanks.
The DxO FilmPack comes in two editions: Essential and Expert, and two version (3 and 4).
The free license being offered is for the Essential edition, version 3. This is a permanent license which wont expire.
From the same link, you can also get a trial 31-day license for the new version 4 (Essential or Expert edition).
As you might expect, the "Expert" edition has more film emulations, more filter effects, more customization sliders, etc.
If you signed up for the free Version 3 Essential license, but haven't received it yet, be sure to check your SPAM mailbox for the email instructions.
EDIT UPDATE: I emailed DxO and received a prompt reply with the required code.
If the plugin didn't install, I think you can manually set it as an "Additional External Editor" in Lightroom:
From Lightroom, go to the Preferences menu > External Editing tab. Under the "Additional External Editor" section, create a new preset from an existing one. Then change the Application entry by clicking on the "Choose" button and select DxO FilmPack from the Applications folder. Set the file format to your liking (e.g. TIFF, ProPhoto RGB, 16-bits, 240 dpi, no compression). Ensure that the "Stack With Original" checkbox is selected (should already be selected by default).
Close the Preferences menu and you should now be able to select DxO FilmPack (from the Photo > Edit In menu or by right-clicking on a picture).