The Super Serial Card is a nice and you don't need any software to use it. Typing "PR#2" followed by "IN#2" (replace the "2" with the slot number the card is installed in) will give you access to a very simple serial communications terminal. Granted, it does take some configuration for both computers to understand each other.

You can also search for scans of books and magazines online. People have been working on preserving these materials since the mid-1990's, so there are many excellent resources.