At Length is an online magazine not affiliated with any particular organization. Here's what it has to say about itself:
At Length is a venue for ambitious, in-depth writing, music, photography, and art that are open to possibilities shorter forms preclude. As a print-friendly online magazine, we create ways for readers, listeners, and viewers to interact with noteworthy long work.
Hear that? They like reeeeaaaaally long forms. Despite that fact, they've recently published some gorgeous poetry and some impish and well-written prose. Check out especially Jee Leong Koh's ghazal sequence "A Lover's Recourse": so elegant.
They'll be accepting submissions January through March.