Documentation

• ConTeXt and LuaTeX documentation is quite extensive. Start with Basics. Others manuals give specifics details to understand the foundations, explore advanced features, write macros or modify existing features.
• Old manuals are at the end of the list, with an "obsolete" banner. They can help you find your way between the different versions

• All
• Basics
• Fonts
• Color
• Graphics
• Layout
• Tables
• Bibliography
• Sciences
• Interaction
• Languages
• ConTeXtTools
• XML
• Programming-DB
• Development
• TextEditors

• 
  ConTEXt reference manual 2001 – Complete, but never up-to-date, cleaned-up. (2001)
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  What is ConTeXt? (2011)
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  ConTEXt reference manual 2013 - Complete, but never up-to-date, and not fully cleaned-up. (2013)
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  ConTeXt Mark IV an excursion (2017)
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  ConTeXt commands reference - short syntax reference of all the commands (2020)
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  Fonts out of ConTeXt – Almost everything about Fonts, processing and use (2016)
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  Coloring ConTeXt - Color spaces, profiles, transparency etc., also in MetaPost (2016)
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  Flowcharts (2016)
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  Metafun - For graphics, MetaPost is embedded (2017)
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  Nodes – Diagrams, graphical representations of relations, processes… (2018)
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  Rules – rules bounded to the typeset text (2018)
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  Graphics - integrating graphics in your document (2018)
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  SVG in ConTeXt and metafun xl (2019)
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  Metafun xl or LuaMetaFun (2019)
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  Typographic Programming - TeX thinking, line-breaking, protrusion,… (2004)
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  In the details. Hints: grid typesetting, columns, backgrounds, graphics issues, formula tuning (2015)
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  Column sets (2016)
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  Pages Columns (2017)
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  Spacing in ConTeXt – Line spacing, line correction in grid typesetting (2018)
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  Natural Tables in ConTEXt – Examples (2001)
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  Simple Spreadsheets in ConTeXt MkIV (2016)
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  Extreme Tables in ConTeXt MkIV (2018)
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  Bibliographies the ConTeXt way (2017)
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  PPCHTeX - macros for typesetting chemical structures (2001)
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  PPCHTeX example - Chemical Formulas in ConTeXt (2001)
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  OpenMath in ConTeXt – Examples (2006)
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  MathML (2015)
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  Units - SI units support (2015)
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  MathML in ConTeXt – Examples (2016)
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  Math rendering (2018)
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  Interactivity (2018)
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  Languages in ConTEXt – explaining luatex and mkiv (2016)
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  L2R R2L – a few tips (2019)
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  Modes – Modes are used for conditionnal processing (screen, A4, letter…) (2008)
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  Read Me first (2016)
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  ConTeXt Musing (2018)
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  TeX iT (2018)
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  Tip Trick (mtxrun command) (2018)
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  Workflows support in ConTeXt - MkIV and LuaTeX features for efficiency (2019)
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  Low Level Tex – Boxes (2019)
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  Low Level Tex – Conditionals (2019)
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  Low Level Tex – Expansion (2019)
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  Low Level Tex – Registers (2019)
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  LuaTeX Reference Manual (2020)
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  LuaMetaTeX Reference Manual (2020)
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  Luatools mtxrun for ContTeXt (2020)
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  Figures – ConTeXt XML (2001)
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  MathML – ConTeXt XML (how to invoke mathml, addendum of mathml) (2001)
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  PhysML – ConTeXt XML (2001)
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  ChemML – ConTeXt XML (2001)
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  Directory Trees (2004)
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  Exporting XML and ePub from Context (2015)
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  Dealing with XML in ConTeXt MkIV (2016)
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  XML/Lua templates (2016)
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  Steps – ConTeXt XML (2017)
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  SWIGlib – Basics : use external libraries (2016)
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  Lua - the ConTeXt libraries (2016)
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  ConTeXt Lua Documents (2018)
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  SQL in ConTeXt (2020)
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  Librairies – Basics (2020)
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  ECMA SCRIPT in context lmtx - using the optional mujs library (2020)
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  2- MkIV Hybrid Technology - How LuaTeX combines TeX, MetaPost, Lua and XML (2012)
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  3- About LuaTeX and ConTeXt in 2015 (2015)
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  1- Context MarkII MarkIV - The history of LuaTeX 2006–2009 (2016)
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  4- Still going on (2016)
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  4.5- On and on (2016)
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  5.5- Not Now (2018)
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  5- Following up (current working report) (2019)
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  6- Even More – fun with luametatex and context (2020)
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  Scite in Context MkIV : editor setup (2011)
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  ConTeXt Mark IV an excursion (1999)
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  TexFont explained (2001)
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  Fonts chapter (2005)
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  Fonts in Context (2005)
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  Font Sampler (MkII) (2005)
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  Colors separation (2002)
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  Charts uncovered (1999)
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  Widgets uncovered - Form elements, cross references, JavaScript in PDF (2001)
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  Creating MetaPost outlines (2001)
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  Labels : Adding Text to Graphics (2002)
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  Columns (2003)
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  Correspondence (2003)
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  Correspondence with ConTEXt (2010)
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  ConTeXt rehab for amsmath addicts (2006)
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  Chinese in Context (2001)
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  TeXEXEC explained (2001)
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  How to install Context (2001)
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  TeXUTIL (2001)
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  TeXwork (2001)
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  PRAGMA POD example gui (2002)
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  Weaving PS into PDF (2003)
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  texsync (2003)
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  Hyphenation patterns (2005)
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  Preprocessing Source Files & Manipulating Graphic Resources (2005)
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  TEXMF Start (2006)
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  XML in ConTeXt (MkII) (2001)
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  Just an XML FO engine (2004)
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  Scite in Context : short manual (2006)

Remarks

• To save time of developers, please, read the manuals before you start asking questions at the mailing list.
• Most of the manuals are available in the ConTeXt distribution, and on the mirrors like bitbucket.org, with their sources,
• An other overview is also available at Pragma-Ade website, with an interactive PDF as the Manuals Gallery,
• Some printed versions can be purchased from H2O-Books:
  • MetaFun manual - 2010
  • MKII – MKIV, the history of LuaTeX - 2010
  • Layouts in ConTeXt - 2011
  • Fonts in ConTeXt - 2011
• Henri Menke is also gathering this precious material at The definitive guide to ConTeXt MkIV documentation.