Fountain pens dry out if they are not capped immediately after being used. Since capping and uncapping a pen usually requires two hands, a stand would come in handy for, say, writing sporadic notes in a book. Unfortunately such stands are not readily available. I've taken to simply clamping a large document clip onto the cap of my Lamy Safari; it works very well. Gravity keeps the cap sealed, but not latched; thus uncapping requires only one hand and minimal effort.
Step 1: Attach a Document Clip to Your Pen.