{Wim Obbels, Bart Snapp, Jim~Fowler}
{Ximera interactive math educational resources for all: From \LaTeX\ source code to \PDF, \HTML\ and beyond}
{Ximera is an open-source platform to create online interactive
\acro{STEM} courses using \LaTeX\ as the source code. Initially
developed at the Ohio State University (\acro{OSU}), now around a dozen
institutions are using Ximera materials. Backend development of the
project has extended from just \acro{OSU} to now include educators at
the University of Florida and \acro{KU} Leuven.

In this talk we will explain the basic ideas of how Ximera works and
demonstrate how the currently available courses easily implement
interactive questions, integrate applets from youtube, desmos or
geogebra, hyperlinks, etc., and how this, based on \TeX4ht, rather
smoothly translates between \HTML\ and \PDF.

After installing the Ximera package from \CTAN, one can immediately
generate \PDF\ versions. To publish an online version an extra build
environment (\tbcode{xake}) is needed which enables publishing courses to
a public server at \url{https://ximera.osu.edu} or optionally to a
self-hosted server. Ximera can be integrated with learning management
systems, collects useful learning analytics, and can return results to a
gradebook.

It is currently under active development, getting extra functionality,
more examples and tutorials, options for styling courses both online and
in \PDF, and integrated gradebook functionality. Moreover, a docker setup
will soon be available for easy deployment, and even a serverless setup
with compilation-in-the-browser.

The \acro{CI/CD} integration currently used at \acro{KU} Leuven will be
explained, which automatically updates the online content and all the
corresponding \PDF{}s whenever authorized authors git-push changes.}