I've been trying to put together a list of the 2014 Free RPG Day releases in PDF and it's really short. I think I must have subconsciously already known this, as it's taken me over 4 months to even look.
The Doom Cave of the Crystal-Headed Children is available in PDF as PWYW
A Druid's Lament for C&C is $4.99 in PDF - go figure
Make Your Own Luck for 13th Age apparently doesn't have a PDF version
Same for the Shadowrun / Battletech Quickstart
As for the DCC RPG/Xcrawl Free RPG Day 2014 release? $4.99 (same as every year)
I didn't see this year's Cosmic Patrol Quickstart on RPGNow
There are a crapload of Valiant Universe Quickstarts over at RPGNow - no idea if any are the Free RPG Day release, but they are all free.
Previous years seem to have had more PDF releases if I recall correctly.