Grimm (DLC 1) + This also gives you 3 Card drops
http://steamproxy.net/steamstore/app/261390/

The Descendant (Ep1) + This also gives you 3 card drops
https://steamproxy.net/steamstore/app/351940/

Heroine's Quest: The Herald of Ragnarok
http://steamproxy.net/steamstore/app/283880/

Serena
http://steamproxy.net/steamstore/app/272060/

Penumbra: Necrologue
http://steamproxy.net/steamstore/app/346290/

Portal 2 Sixense Perceptual Pack
http://steamproxy.net/steamstore/app/247120/

RACE 07: Andy Priaulx Crowne Plaza Raceway (Free DLC)
http://steamproxy.net/steamstore/app/8650/

Romance of three Kingdoms Maker
http://steamproxy.net/steamstore/app/397720/

SOS
https://steamproxy.net/steamstore/app/619080/

-There is also a script that will allow you to install all the free packages (including these) it will also install a bunch of other stuff