PNGd
PNGd is a term used in computing to denote software components related to the Portable Network Graphics (PNG) format. There is no single canonical project by this name, and the label is sometimes applied to different implementations that handle PNG images in various contexts. As a result, the exact features and interfaces of PNGd can vary between projects, environments, and programming languages.
In one common usage, PNGd refers to a daemon or background service embedded in image-serving stacks. As
In another usage, PNGd is a library that developers integrate into applications to work with PNG data
Development and licensing for PNGd projects are typically open-source, with permissive licenses common in the field.