I can't help with Analog, but we're in a golden age of free SF online. My vague feeling is Clarkesworld[0] may be most similar to Analog's editorial POV, and RocketStackRank[1] provides an overview of what several other SFWA-qualifying venues are publishing. Compelling[2] comes to mind as a (currently) non-qualifying market probably aiming at an audience like Analog's.

[0]: http://clarkesworldmagazine.com/

[1]: http://www.rocketstackrank.com/search/label/Monthly

[2]: http://compellingsciencefiction.com/