Most fireplace glass doors are made of tempered glass with either ceramic or anodized aluminum frames. Glass is placed on the door so that the fire can still be appreciated even with the door closed. Most of these fireplace doors can be bought stock - meaning that most of the door that are for sale can be purchased off the rack and installed with minimal changes.
When thinking of modern versions of a fireplace necessity, the log holder comes to mind. The older styles did the job of holding wood beside the hearth but not too close to the fireplace to allow for ease in keeping a fire going with more wood. Now, not only will the holder do just that, it will come in two pieces to make the job even easier to bring the wood inside.