Document

General and multi-function

 * ActiveMime (format used to store macros within MS Office documents)
 * Google Document (.gdoc)
 * iWork (Apple; used for Pages, Numbers, and Keynote)
 * Microsoft Compound File (OLE Compound Document)
 * Microsoft Office
 * Microsoft Works
 * Office Open XML
 * OpenDocument (ODF; OASIS)
 * OpenOffice.org XML
 * StarOffice binary formats
 * UOF (Chinese office document format)

Collaboration

 * Microsoft OneNote (ONE, ONEPKG)

Desktop Publishing

 * Calamus (.cdk)
 * Impression
 * Microsoft Publisher (.pub)
 * PUZ (archived "Pack and Go" file)
 * Newsroom, The
 * PageMagic (.dtp)
 * PageMaker (originally from Aldus, later Adobe)
 * Print Shop, The (Broderbund)
 * Scribus (.sla, .scd)
 * Serif PagePlus (.ppp)
 * Timeworks Publisher (also released as Publish It!) (.dtp)

Document Processors
(similar to word processors and desktop publishing but designed particularly for building structured documents such as technical documentation)


 * FrameMaker
 * Element Definition Document
 * Maker Interchange Format (MIF)
 * LaTeX
 * Scribe
 * TeX
 * troff

Documentation combined with source code

 * CWEB
 * Doxygen
 * Javadoc
 * Noweb
 * Pod
 * RDoc
 * WEB

Document storage/exchange formats (non-program-specific)

 * AFP (Advanced Format Printing)
 * CSV (Comma Separated Values)
 * Data Interchange Format (DIF)
 * DDIF
 * DjVu
 * OpenXPS
 * PDF (Portable Document Format)
 * Plain text (TXT) (Un-structured text document)
 * PostScript
 * RTF (Rich Text Format)
 * RTFD (Rich Text Format Directory)
 * SYLK (Symbolic Link)
 * WWF (non-printable variant of PDF)

Label making

 * P-touch Editor Label (.lbt, .lbx)

Presentation

 * Harvard Graphics
 * Keynote (Apple iWork/iCloud)
 * OpenDocument Presentation (.odp, .otp)
 * PmDraw
 * PowerPoint
 * PPS (PowerPoint slide show- autoplay)
 * PPSM (PowerPoint macro-enabled slide show)
 * PPSX (PowerPoint slide show, XML format- autoplay)
 * POT (PowerPoint template)
 * POTM (PowerPoint macro-enabled template)
 * POTX (PowerPoint template, XML format)
 * PPT (PowerPoint presentation)
 * PPTM (PowerPoint macro-enabled presentation)
 * PPTX (PowerPoint presentation, XML format)
 * SXI (StarOffice / OpenOffice.org) (.sxi, .sti)

Spreadsheet

 * Ability Spreadsheet (.aws, .ast)
 * Gnumeric (.gnumeric, .gnm)
 * Google Sheet (.gsheet)
 * Lotus 1-2-3 (.wks, .wk1, .wk2, .wk3, .wk4)
 * Lotus Symphony
 * Microsoft Excel
 * SpreadsheetML (XML format preceding later XLSX format)
 * XLM (Excel spreadsheet macro, old pre-XML format)
 * XLS (Excel spreadsheet old pre-XML format)
 * XLSB (Excel binary workbook)
 * XLSM (Excel macro-enabled spreadsheet format, XML version)
 * XLSX (Excel spreadsheet format, XML version)
 * XLT (Excel template, old pre-XML format)
 * XLTM (Excel macro-enabled template, XML version)
 * XLTX (Excel template, XML version)
 * Microsoft Works Spreadsheet (.wks)
 * Mouse Calc (Apple II)
 * MultiPlan (early Microsoft spreadsheet)
 * Numbers (Apple iWork/iCloud)
 * OpenDocument Spreadsheet (.ods, .ots)
 * pfs:Plan
 * Quattro Pro
 * SDC (StarOffice spreadsheet)
 * SuperCalc 3
 * Swift Spreadsheet (Atari 8-bit)
 * SXC (OpenOffice.org 1.0 Spreadsheet) (.sxc, .stc)
 * VisiCalc

(or you can just do a spreadsheet with pen and paper)

Word Processor

 * Ability Write (.aww, .awp)
 * AbiWord (.abw)
 * AppleWorks
 * Bank Street Writer
 * Breeze
 * Canon Cat
 * ChiWriter (.chi)
 * ClarisWorks (Mac) (CWK)
 * Cut & Paste (Electronic Arts Home Management Software)
 * DotWriter (TRS-80, Apple II)
 * EasiWriter / TechWriter (Word processor file format)
 * Easywriter
 * The Electric Pencil (word processor for 8080/Z-80 machines, and later IBM PC)
 * EPOC Word
 * HomeWord (Sierra Online, Apple II)
 * HWP (Hancom Word, Korean)
 * HWPML (Hangul Word Processor Markup Language, Korean)
 * IBM Displaywriter (dedicated word processing machine)
 * IBM Writing Assistant (.iwa)
 * JOT (Juggler Of Text; experimental word processor by Ted Nelson c. 1980)
 * Kingsoft Office (.wps, .wpt)
 * LocoScript
 * LWP (Lotus WordPro Document)
 * MacWrite
 * Magic Window
 * MCW
 * Microsoft Word
 * DOC (Word document)
 * DOCM (Word macro-enabled document)
 * DOCX (Word document, XML format)
 * DOT (Word template)
 * DOTM (Word macro-enabled template)
 * DOTX (Word template, XML format)
 * WordProcessingML (XML format preceding later DOCX one)
 * Microsoft Works Word Processor (.wps, .wpt)
 * Microsoft Write (.wri)
 * Mouse Word (Apple II)
 * Mousewrite (Apple II; apparently a different program from Mouse Word)
 * MultiMate Professional Word Processor (.dox, .pat)
 * OpenDocument Text (.odt, .ott)
 * Pages (Apple iWork/iCloud)
 * PC-Write
 * Perfect Writer
 * pfs:Write
 * PIE Writer (Hayden Software, Apple II)
 * Psion Series 3 Word (.wrd)
 * Samna Word
 * Scripsit
 * ScreenWriter II (for Apple II; formerly SuperScribe II)
 * Scrivener (.scriv)
 * SDW (StarOffice Writer)
 * SXW and STW (OpenOffice.org 1.0 Text) (.sxw, .stw)
 * TechWriter (Scientific word processor file format)
 * TI-Writer
 * Volkswriter
 * Wang (dedicated word processing machines)
 * Wang 1200 (1972; used cassette storage)
 * Wang OIS (1977; used disks)
 * WordPerfect
 * WordStar
 * WordStar 2000

Other

 * 602
 * ACL
 * CCF
 * Computable Document Format (.cdf)
 * EGT
 * FDX
 * FTM
 * FTX
 * MBP
 * ODM
 * OMM
 * OTT
 * PAP
 * PDAX
 * Photoshop Text Engine Data
 * QUOX
 * RPT
 * UOML
 * VIA
 * WRD
 * WRF

See also Markup

Links

 * CVs and File Extensions
 * Trustworthiness of Information by File Extension (xkcd comic with discussion thread)
 * Text editors in Lord of the Rings
 * Sharing or collaborating with government documents (UK government proposal)
 * Four Skills That Will Turn You Into a Spreadsheet Ninja
 * Document Freedom Day: Celebrating information accessibility and raising awareness of Open Standards.
 * G-Cloud and open file formats, a cautionary tale
 * Redaction rules: How best to keep the secrets
 * Testing for encrypted Office documents
 * Pandoc: Document format conversion swiss-army knife
 * Give Me Text: online converter of various document formats to plain text
 * The Writer's Guide to Word Processing File Formats
 * Document Liberation Project