I realize "its the web" is a thing but back when I was doing freelance writing for tech magazines I found the Writers Market[1] very handy. For print publications it had print calendars and editorial descriptions of what they liked to publish. I've not bought one since the rise of web journalism but I expect there are resources out there which have this info.
This is pretty much old hat. Duotrope[1] is one of the larger market listings. There was a big huff after they turned to a subscription model, which led to the creation or expansion of The Grinder[2].
At Aliterate[3] we've seen about 25% of our inbound submissions coming from each of The Grinder and Ralan[4]. The balance is some mix of Duotrope and smaller players.
[1] http://www.amazon.com/Writers-Market-2016-Trusted-Published/...