\usemodule[t-gantt]
\setuppapersize[landscape][landscape]
\setuplayout[scale=0.8]
\setuppagenumbering[location=]

\starttext
  \startgantt[xunitlength=0.5cm,fontsize=\tfx,titlefontsize=\tfx,drawledgerline=true]{20}{33}
    \startganttitle
      \titleelement{2010}{14}
      \titleelement{2011}{19}
    \stopganttitle
    \startganttitle
      \titleelement{Oct}{5}
      \titleelement{Nov}{4}
      \titleelement{Dec}{5}
      \titleelement{Jan}{4}
      \titleelement{Feb}{4}
      \titleelement{Mar}{5}
      \titleelement{Apr}{4}
      \titleelement{May}{2}
    \stopganttitle
    \startganttitle
      \numtitle{39}{1}{52}{1}
      \numtitle{1}{1}{19}{1}
    \stopganttitle
    \ganttbar[color=red]{Git repository}{3}{1}
    \ganttbar[color=red]{Binary packages}{3}{1}
    \ganttbar[color=red]{Building system}{3}{1}
    \ganttbar[color=red]{GUI}{3}{1}
    \ganttbarcon[color=red]{ConTeXt}{4}{1}
    \ganttbar[color=red]{TeXML}{4}{1}
    \ganttbar[color=red]{Export functions}{4}{1}
    \ganttbarcon[color=red]{Displaying output}{5}{1}
    \ganttbarcon[color=red]{Configuration System}{7}{1}
    \ganttbarcon[color=red]{Open/Save and Undo/Redo}{8}{1}
    \ganttbarcon[color=red]{On-the-fly typesetting}{9}{1}
    \ganttbarcon[color=red]{Command line client}{10}{1}
    \ganttbarcon[color=red]{Remote}{11}{1}
    \ganttbar[pattern=crosshatch,color=blue]{Library system}{16}{4}
    \ganttbarcon[pattern=crosshatch,color=blue]{Handwriting recognition}{20}{4}
    \ganttbarcon[pattern=crosshatch,color=blue]{MathML editor}{24}{4}
    \ganttbarcon[pattern=crosshatch,color=blue]{Release builds}{28}{1}
  \stopgantt
\stoptext