Corel Aftershot 3 for free with upgrade to full Pro version for just £15.99 if you want the extra features of Pro. EDIT: STILL AVAILABLE FEB 2017 - Direct from Corel. Usually £54.99 for the Pro version. Free software offer ends 31st December so be quick.
Corel are giving away the Aftershot 3 RAW image editing software for free until 31st December and thanks to some detective work I've got a genuine upgrade offer for just £15.99 to get the full Pro version.
£15.99 Upgrade link in post #1