SExtractor (Source-Extractor) is a program that builds a catalogue of objects from an astronomical image. It is particularly oriented towards reduction of large scale galaxy-survey data, but it also performs well on moderately crowded star fields.
This code is used in conjunction with a written survey. The answers people give on the survey are entered into the DataMatch, and it produces pairs based on answer similarities. While originally design for use with a school fundraiser, it can easily be