There are many industry magazines that you can get a free subscription to if you qualify. Qualifying usually means that you work with products that are sold in the advertising in that magazine.

Here are several links to pages that list lots of magazines that you can subscribe to for free.

These are the magazines that I subscribe to, used to subscribe to, or buy on the newstand as well as links to articles I have found interesting and decided to keep a reference to.

Computer Magazines

Engineering Magazines

Linux/Unix Magazines

Software Magazines