The Tiki ((Integrator)) permits some basic integration.
https://en.wikipedia.org/wiki/Comparison_of_documentation_generators
---
{HTML()}<script type='text/javascript' src='https://openhub.net/p/doxygen/widgets/project_factoids_stats?format=js'></script>{HTML}
---
{HTML()}<script type='text/javascript' src='https://openhub.net/p/phpdox/widgets/project_factoids_stats?format=js'></script>
{HTML}
---
{HTML()}<script type='text/javascript' src='https://openhub.net/p/phpDocumentor/widgets/project_factoids_stats?format=js'></script>{HTML}
https://packagist.org/packages/phpdocumentor/phpdocumentor
---
{HTML()}<script type='text/javascript' src='https://openhub.net/p/ROBODoc/widgets/project_factoids_stats?format=js'></script>{HTML}
---
https://github.com/aosm/headerdoc