General Synonyms:
* Kindness
* Altruism
* Benevolence
* Magnanimity
* Liberality
* Charitableness
* Openhandedness
* Unselfishness
* Bounty
* Big-heartedness
More Specific Synonyms:
* Munificence (great generosity, especially in giving money)
* Philanthropy (generosity towards public causes)
* Hospitality (generosity in welcoming and treating guests)
* Largesse (generous giving, especially of money)
The best word to use depends on the specific situation and the nuance you want to convey.