Installing TikZ and pgfplots

The ConTeXt distribution comes with MetaPost and MetaFun, a powerful graphical programming language, further extended by MetaFun. It also supports TikZ and Pgfplot as third-party modules, making it easy to include existing or new PGF figures in a document.

The simplest way to install them is via the module-install script which is included in the distribution. In particular,

 cd <context-install-dir/tex>
 mtxrun --script install-modules --install tikz

installs both tikz and pgfplots. See installing modules by script for details