Last year's Google Summer Of Code project was creating a new apropos(1). Though the current version already has a web interface, adding CSS and appropriate HTML to the web interface would be nice to integrate it to other websites.
Though the source code is written in C, C knowledge is not necessary. You just have to extract the HTML and pseudo-understand what the code around it does, i.e. in which cases the single actions are taken.
The file which would be modified is apropos-utils.c.https://github.com/abhinav-upadhyay/apropos_replacement/tree/cgi