Note-Taking
Evernote: (Mac, Win)
Gournal: (Linux)
Mynotex: (Linux)
Notelab: (Linux, Mac, Win)
Tomboy: (Linux)
TreeLine: Notes/Database (Linux, Win)
Xournal: PDF Annotator (Linux, Mac, Win)
Office Productivity Suites
Apache OpenOffice: (Linux, Mac, Win)
Apache OpenOffice: Portable (Win)
AbiWord: (Linux, Mac, Win)
AbiWord: Portable (Win)
Bean: MSW Clone (Mac)
Calligra: (Linux, Mac, Win)
CryptPad: (Linux, Mac, Win)
Etherpad: (Linux, Mac, Win)
Joeoffice: (Mac, Linux, Win)
KOffice Suite (Linux, Mac)
LibreOffice (Linux, Mac, Win)
LibreOffice: Portable (Win)
MSWord : Free (Dos)
NeoOffice: (Mac)
OnlyOffice (Linux, Mac, Win)
Siag Office: (Linux, Mac)
WordPerfect: (Linux )
PDF
Combine PDF (Mac)
doPDF: Create, Convert, doPDF (Win)
Evince: PDF Viewer (Linux)
Final Page: Post Production (Linux)
Formulatepro: PDF Editor (Mac)
GhostView: PDF View (Linux, Mac, Win)
Ghostscript: PDF View (Linux, Mac, Win)
gImageReader: Extract Text from PDF (Linux, Mac)
GSView: PDF View (Linux, Mac, Win)
ICEpdf: Java PDF (Linux, Mac, Win)
Jarnal: Notetaker, PDF Annotator (Linux, Mac, Win)
MacGSView: View (Linux, Mac, Win)
Master PDF Editor (Linux, Mac, Win)
Evernote: (Mac, Win)
Gournal: (Linux)
Mynotex: (Linux)
Notelab: (Linux, Mac, Win)
Tomboy: (Linux)
TreeLine: Notes/Database (Linux, Win)
Xournal: PDF Annotator (Linux, Mac, Win)
Office Productivity Suites
Apache OpenOffice: (Linux, Mac, Win)
Apache OpenOffice: Portable (Win)
AbiWord: (Linux, Mac, Win)
AbiWord: Portable (Win)
Bean: MSW Clone (Mac)
Calligra: (Linux, Mac, Win)
CryptPad: (Linux, Mac, Win)
Etherpad: (Linux, Mac, Win)
Joeoffice: (Mac, Linux, Win)
KOffice Suite (Linux, Mac)
LibreOffice (Linux, Mac, Win)
LibreOffice: Portable (Win)
MSWord : Free (Dos)
NeoOffice: (Mac)
OnlyOffice (Linux, Mac, Win)
Siag Office: (Linux, Mac)
WordPerfect: (Linux )
Combine PDF (Mac)
doPDF: Create, Convert, doPDF (Win)
Evince: PDF Viewer (Linux)
Final Page: Post Production (Linux)
Formulatepro: PDF Editor (Mac)
GhostView: PDF View (Linux, Mac, Win)
Ghostscript: PDF View (Linux, Mac, Win)
gImageReader: Extract Text from PDF (Linux, Mac)
GSView: PDF View (Linux, Mac, Win)
ICEpdf: Java PDF (Linux, Mac, Win)
Jarnal: Notetaker, PDF Annotator (Linux, Mac, Win)
MacGSView: View (Linux, Mac, Win)
Master PDF Editor (Linux, Mac, Win)
PDF (continued)
Okular: Viewer (Linux)
Pandoc: Converter (Linux, Mac, Win)
PDF Arranger (Linux)
PDF Readers & Creators (Linux, Mac, Win)
PDFedit (Linux)
PDF Editing Tools (Linux, Mac, Win)
PDF Extension (Linux, Mac, Win)
PDF Mix Tool (Linux)
PDFRead (Linux, Mac, Win)
PDFsam: Split & Merge (Linux, Win)
PDF software (Linux, Mac, Win)
PDFTK: Build, Join, Split, Rotate (Linux, Mac, Win)
PDF-Xchange Viewer (Win)
PoDoFo: Libraries (Linux, Mac, Win)
QPDF: Transformations (Linux, Mac, Win)
Sun PDF Import (Linux, Mac, Win)
SWFTools: Text Tools (Linux, Win)
Win2PDF: Creator (Win)
Xpdf: Reader (Linux, Win)
Text Editors
Antiword: Reader (Linux, Mac, Win)
Atom: Hackable editor (Linux, Mac, Win)
Celtx: Screenwriting (Linux, Mac, Win)
BBedit (see TextWrangler): Mac
Docutils: Text Processing (Linux)
Dokuwiki: Wiki (Linux)
Emacs & Aqua: (Linux, Mac, Win)
Encryptpad: Secure Text (Linux, Mac, Win)
Etherpad: Web Editor (Linux, Mac, Win)
eany: Editor (Linux, Win)
GEdit: Editor (Linux)
Glipper: Clipboard (Linux)
Gmate: Editor (Linux)
Gtkedit: (Linux)
Hexeditor: Linux, Mac, Win)
JEdit: Editor (Linux, Mac, Win)
Joe's: Editor (Linux)
Kate: Editor (Linux)
Leaf: Editor (Linux)
Okular: Viewer (Linux)
Pandoc: Converter (Linux, Mac, Win)
PDF Arranger (Linux)
PDF Readers & Creators (Linux, Mac, Win)
PDFedit (Linux)
PDF Editing Tools (Linux, Mac, Win)
PDF Extension (Linux, Mac, Win)
PDF Mix Tool (Linux)
PDFRead (Linux, Mac, Win)
PDFsam: Split & Merge (Linux, Win)
PDF software (Linux, Mac, Win)
PDFTK: Build, Join, Split, Rotate (Linux, Mac, Win)
PDF-Xchange Viewer (Win)
PoDoFo: Libraries (Linux, Mac, Win)
QPDF: Transformations (Linux, Mac, Win)
Sun PDF Import (Linux, Mac, Win)
SWFTools: Text Tools (Linux, Win)
Win2PDF: Creator (Win)
Xpdf: Reader (Linux, Win)
Text Editors
Antiword: Reader (Linux, Mac, Win)
Atom: Hackable editor (Linux, Mac, Win)
Celtx: Screenwriting (Linux, Mac, Win)
BBedit (see TextWrangler): Mac
Docutils: Text Processing (Linux)
Dokuwiki: Wiki (Linux)
Emacs & Aqua: (Linux, Mac, Win)
Encryptpad: Secure Text (Linux, Mac, Win)
Etherpad: Web Editor (Linux, Mac, Win)
eany: Editor (Linux, Win)
GEdit: Editor (Linux)
Glipper: Clipboard (Linux)
Gmate: Editor (Linux)
Gtkedit: (Linux)
Hexeditor: Linux, Mac, Win)
JEdit: Editor (Linux, Mac, Win)
Joe's: Editor (Linux)
Kate: Editor (Linux)
Leaf: Editor (Linux)
Text Editors (Continued)
Leafpad: Editor (Linux)
Medit: Editor (Linux, Win)
Music: Notation (Linux, Mac, Win)
Nano: Editor (Linux)
Nedit: Editor (Linux)
Notepad2:Text Editor (Win)
Notepad Plus: Editor (Win)
NoteTab: HML Editor (Win)
PyRoom: Editor (Mac, Win)
SciTE: Editor (Linux, Win)
reStructuredtext: Markup Syntax (Linux)
Scribes: Gnome Editor (Linux)
Sed: Streams Editor (Linux)
Tea-Editor: (Linux, Win)
Ted: Editor (Linux)
Text Editors: Various (Linux, Mac, Win)
Textroom: Editor (Linux, Mac, Win)
TextWrangler: (Mac)
Tiddlywiki: Web Notebook (Linux, Mac, Win)
TinyMCE: Editor (Linux, Mac, Win)
Recode: Converter (Linux)
Vim: Editor (Linux, Mac, Win)
WordGrinder (Linux, Mac, Win)
WordPress: Publishing (Linux, Win)
Writetype: Writing Made Easy (Linux, Win)
XML: Editor (Linux, Mac, Win)
XPad: Editor (Mac)
Zim : Editor (Linux, Win)
Type Setting
AUCTeX: Typesetting (Linux, Mac, Win)
Gummi: Typesetting (Linux, Mac, Win)
Kile: Typesetting (Linux)
LaTex: Typesetting (Linux, Win)
Latex2RTF: Translator (Linux, Mac,Win)
Lyx: Typesetting (Linux, Mac, Win)
MiKTeX: Type Setting (Win)
TeX: Typesetting (Linux, Win)
TexMacs: Typesetting (Linux, Mac, Win)
Texmaker: Typesetting (Linux, Mac, Win)
Leafpad: Editor (Linux)
Medit: Editor (Linux, Win)
Music: Notation (Linux, Mac, Win)
Nano: Editor (Linux)
Nedit: Editor (Linux)
Notepad2:Text Editor (Win)
Notepad Plus: Editor (Win)
NoteTab: HML Editor (Win)
PyRoom: Editor (Mac, Win)
SciTE: Editor (Linux, Win)
reStructuredtext: Markup Syntax (Linux)
Scribes: Gnome Editor (Linux)
Sed: Streams Editor (Linux)
Tea-Editor: (Linux, Win)
Ted: Editor (Linux)
Text Editors: Various (Linux, Mac, Win)
Textroom: Editor (Linux, Mac, Win)
TextWrangler: (Mac)
Tiddlywiki: Web Notebook (Linux, Mac, Win)
TinyMCE: Editor (Linux, Mac, Win)
Recode: Converter (Linux)
Vim: Editor (Linux, Mac, Win)
WordGrinder (Linux, Mac, Win)
WordPress: Publishing (Linux, Win)
Writetype: Writing Made Easy (Linux, Win)
XML: Editor (Linux, Mac, Win)
XPad: Editor (Mac)
Zim : Editor (Linux, Win)
Type Setting
AUCTeX: Typesetting (Linux, Mac, Win)
Gummi: Typesetting (Linux, Mac, Win)
Kile: Typesetting (Linux)
LaTex: Typesetting (Linux, Win)
Latex2RTF: Translator (Linux, Mac,Win)
Lyx: Typesetting (Linux, Mac, Win)
MiKTeX: Type Setting (Win)
TeX: Typesetting (Linux, Win)
TexMacs: Typesetting (Linux, Mac, Win)
Texmaker: Typesetting (Linux, Mac, Win)