Open Office of which ODT is part of was developed by Sun Microsystems around twenty years ago. The software is open source and is seen as a viable free alternative to Microsoft's Office suite of products. Open Office opens most Microsoft document formats and is is provided as a free download, without restrictions on license. The writer application which produces ODT files is the word processing element of Open Office.
The Open Document Format is an open standard developed by Sun Microsystems under the guidance of OASIS (The Organization for the Advancement of Structured Information Standards). Originally the OpenDocument format was XML based and had at it's root, it now takes the form of a zip file much like Microsoft's DOCX format and takes advantage of the ZIP's compression technology to reduce the overall file size. Writer documents take the form of .odt and .fodt.
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Doc (an abbreviation of document) is a file extension for word processing documents; it is associated mainly with Microsoft and their Microsoft Word application. Historically, it was used for documentation in plain-text format, particularly of programs or computer hardware, on a wide range of operating systems. Almost everyone would have used the doc file format, whenever you write a letter, do some work or generally write on your PC you will use the doc file format. It was in the 1990s that Microsoft chose the doc extension for their proprietary Microsoft Word processing formats. As PC technology has grown the original uses for the extension have become less important and have largely disappeared from the PC world.
Early versions of the doc file format contained mostly formatted text, however development of the format has allowed doc files to contain a wide variety of embedded objects such as charts and tables from other applications as well as media such as videos, images, sounds and diagrams. doc files can also contain mail merge information, which allows a word-processed template to be used in conjunction with a spreadsheet or database.
AbiWord Apple Pages AppleWorks KWord Microsoft Word StarOffice