The Bard's Tale Construction Set is computer software that allows the user to create simple dungeon crawl video games using The Bard's Tale game engine. It was created by Interplay Productions in 1991 and distributed by Electronic Arts. It was released for the Amiga and DOS.
Since it was not required to own The Bard's Tale Construction Set in order to play games which were created with it, one could easily distribute his or her own created games among other people.
Included with the software was a sample scenario for the purpose of playing and learning from, entitled Star Light Festival.
Source: Wikipedia, "http://en.wikipedia.org/wiki/Bard%27s_Tale_Construction_Set," available under the CC-BY-SA License.