A Time of War: The BattleTech RPG Free RPG Day 2013 QSR Available
Battletech, from Catalyst Game Labs, has their Free RPG Day Quick Start Rules pdf available online for free to download.
From the announcement:
Miss out on the chance to grab this years’ Free RPG Day A Time of War QSR? Don’t worry…here’s your chance to nab your free copy of the PDF.