Lotus Magellan
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Lotus Magellan was a groundbreaking DOS-based desktop search package released in the 1980s by Lotus Development, most famous for Lotus 1-2-3. Despite its legendary effectiveness, Magellan was not particularly successful in the marketplace, likely due to the smallish hard drives of the era, and today is generally forgotten.
Running under DOS, Magellan would scan the directories and files on your drive or floppies and create a master index. It was aware of all the various current formats and provided the ability to view files without launching the original applications that created them. Its most powerful feature was fuzzy searching, that connected files by relative frequency of keywords, allowing you to organize related data no matter where or in what format it existed on your computer.
Given this "semantic view" of your file system, Magellan not only exposed "hidden meaning" from disparate data, but also facilitated the actual movement of files and directories into a better physical organization. Cute advertisements that ran for Magellan at the time promised to "Get all your ducks in a row" and showed a picture of a line of obedient rubber ducks.
Magellan was one of several significant developments from Lotus Software (i.e. "1-2-3", "Notes" and elegant office software for the Apple Macintosh) that, despite significant usefulness and market share, failed to keep the company from becoming another brilliant also-ran. Lotus was acquired by IBM in 1995. The old DOS Lotus software Magellan, Lotus Agenda, Hal, and Lotus Manuscript have since been released as freeware.
