The Librarian (version control system)

The Librarian is a version control system and source code management software product originally developed by Applied Data Research for IBM mainframe computers. It was designed to supplant physical punched card decks as a way of maintaining programs, but kept a card model in terms of its interface. During the 1970s and 1980s it was in use at thousands of IBM mainframe installations and was one of the best-selling software products in the computer industry.

After Applied Data Research was acquired by Computer Associates in 1988, the product became known as CA-Librarian. After that company was acquired by Broadcom in 2018, the product became known simply as Librarian.