An Internet search will bring up zillions of charities or other great organisations that accept knitted and crocheted items.
The following is a list of links to those that I have personally supported:
Battersea Dogs & Cats Home
Cwtch Of Comfort
Knit for Nowt
SIBOL - Sunshine International Blankets of Love
The Innocent Big Knit
Upon Butterfly Wings (this group has now closed)