The Collaborative International Dictionary of English v.0.48:

Open-handed \O"pen-hand`ed\, a.
   Generous; liberal; munificent. -- O"pen-hand`ed*ness, n.
   --J. S. Mill.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "openhanded":
   apparent, big, bighearted, bounteous, bountiful, chivalrous,
   distinct, elevated, evident, exalted, free, freehanded,
   freehearted, generous, giving, gracious, great, great of heart,
   greathearted, handsome, heroic, high, high-minded, hospitable,
   idealistic, knightly, large, largehearted, lavish, liberal, lofty,
   magnanimous, manifest, munificent, noble, noble-minded, obvious,
   open, openhearted, palpable, patent, plain, princely, profuse,
   stintless, straightforward, sublime, ungrudging, unselfish,
   unsparing, unstinted, unstinting