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Wotsit's Format - http://www.wotsit.org/
Detailed file formats and data formats for programmers. A large collection of programming resources with detailed information.
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Sustainability of Digital Formats Planning for Library of Congress Collections - http://www.digitalpreservation.gov/formats/
Provides information about digital content formats from the viewpoint of maintaining sustainable and accessible archives.
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UK National Archives PRONOM Technical Registry - http://www.nationalarchives.gov.uk/PRONOM/
Resource for those requiring definitive information about the file formats, software products and other technical components required to support long-term access to electronic records.
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FILExt - http://filext.com/
Searchable database of file extensions for data formats, with information and notes on each.
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FileInfo.com - http://www.fileinfo.com/
Database of file extensions with information about each file type.
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Dot What?! - http://dotwhat.net/
Database of file extension information. Supports users comments and submissions. Includes discussion forum.
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File-Extensions.org - http://www.file-extensions.org/
Searchable file extension list including descriptions and associated applications.
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Almost Every File Format in the World - http://www.ace.net.nz/tech/TechFileFormat.html
Names many file formats and their extensions.
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Uniblue File Extension - http://www.file-extension.com/
Searchable database of file extensions, explaining what they are used for and which programs they are associated with.
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Webopedia - Data Formats - http://webopedia.com/Data/Data_Formats/
Contains information about many data formats.
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File Formats Magic Database - http://www.magicdb.org/
Contains information on main file formats as well as an FFID registry and a signature file permitting the identification of files from their contents. Also contains tips on how to design new file formats.
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FileSuffix.com - http://www.filesuffix.com/
A searchable filename extension database.
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DaubNET File Format Collection - http://www.daubnet.com/en/file-formats
The full specifications of various file formats.
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Macintosh Type/Creator Database - http://homepage.mac.com/tcdb/
A database of windows file extension codes with correlating Macintosh Type/Creator code pairs.
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Filerecon Project - http://www.computec.ch/projekte/filerecon/
Developing a program to automatically identify files from their content. Project news, FAQ, and download. [GPL]
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