Submittable offers a discount to CLMP members, and therefore, many literary journals use Submittable as their platform of choice. As a user, you can browse open reading windows by genre and deadline. It's a great place to get started when looking for places to submit both creative writing and visual arts.
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For a better tracker, that allows for you to see better metrics, check out DUOTROPE. They offer a free version, but for $5.00 a month you get the full version and weekly emails with open list of agents, marketplaces, and recent closures. It is a solid collection of literary journals and covers marketplaces that do not utilize Submittable.