Since both of these calls were posted back in December I've probably already mentioned them, but a reminder is always helpful. Perpetual Motion Machine Publishing has two open calls:
Bleed: A Book of Hope is a charity anthology seeking horror stories where the monster represents cancer. A maximum of 10,000 with a June 30 deadline. Profits go to the Children's Cancer Fund.
Long Distance Drunks: A Tribute to Charles Bukowski is looking for stories of 1000 to 10,000 words with a December 31 deadline. Payment is a royalty split.