A quill pen is a writing implement made from a moulted flight feather (preferably a primary wing-feather) of a large bird. Quills were used for writing with ink before the invention of the dip pen, the metal-nibbed pen, the fountain pen, and, eventually, the ballpoint pen. The hand-cut goose quill is rarely used as a calligraphy tool, because many papers are now derived from wood pulp and wear down the quill very quickly. However, it is still the tool of choice for a few professionals and provides an unmatched sharp stroke as well as greater flexibility than a steel pen.

Quintiq is a Dutch company that develops planning, scheduling and supply chain optimization software. The company is headquartered in 's-Hertogenbosch and its North American headquarters are in Radnor, Pennsylvania.