Here are a few examples of American websites which charity knitters can contribute to:
Afghans for Afghans – This charity sends hand-knitted and crocheted blankets, sweaters, vests, hats, mittens, and socks to the people of Afghanistan.
They have Afghan-themed knitting patterns for sale. Those outside the USA can help this charity by buying the patterns from their website.
Check out the work they do here.
Knitting and Giving – A Connecticut-based charity, they provide free knitting patterns for warm items which are distributed to local hospitals, homeless shelters, and similar. They also send donated items to vulnerable people throughout the United States and abroad. You can find out how to donate your knitted items by going to their website.
Steven’s Comfy Toes/Cindy’s Tiny Tootsies – A charity based in the White Pine County area of Nevada, which can experience cold days and nights.
They provides slippers, hats, mittens and scarves to children aged from birth to 12 years whose families may not be able to afford to keep their children’s feet warm.
Donated items are accepted all year, and distributed in winter.
Find out more at their website.
Knitting for Charity - This is an organisation that donates knitted items to a number of charities in the US. In their own words:
"Do you love to knit? Are you passionate about knitting for charity? Or, you would like to know more about knitting for charity -- worthwhile charities to knit for, free patterns you can use for charity knitting projects, great new techniques, information about yarn or supplies, and so on?
If so, you have come to the right place!"
They look like a really enthusiastic set-up! Find out more at their website.
Keep On Knittingis an excellent website that will take you through the basics of knitting from casting on to more complex knitting variations. They also have a section devoted to knitting for charity and would like to hear from your about which charity you knit for and your knitting projects. This seems like a friendly website that really wants to encourage you to take up the needles! You can find them here.