Duotrope

Duotrope’s Digest is an award-winning, free writers’ resource listing over 3375 current Fiction and Poetry publications.

from Duotrope’s website:

Use this page to search for markets that may make a fine home for the piece you just polished. Use the menus at the top and right to explore the rest of the free services we offer writers and editors, including a free online submissions tracker for registered users. We usually make several updates per day, and we check each of the current listings regularly (once a week for most listings) to ensure the most up-to-date database humanly possible. So far this week, we have checked guidelines for 1387 listings, and we have made 382 listing updates. The last update was made 0 hour(s) and 28 minute(s) ago.