I'm not 100% sure what you mean by your question. Are you looking for some cgi script to output html pages?
If you're cgi pages have some server side code on them, converting them (in the simplist fashion: an extension change) to html pages will render all that code useless.
Browsers can display cgi pages perfectly well (http://www.webmasterworld.com/active.cgi [webmasterworld.com]), so if you are worried about compatability that is not an issue (the server controls how files of type .cgi are shown to the browser).
I'm not sure if I've answered your question or not, maybe a little more detail of what you are trying to achieve will help?
In fact, other than Google, I have only ever seen FAST index CGI. They seem to have started this recently.
You need to use .htaccess and ModReWrite, but I can never get this to work (I believe it is my server that is the problem, not me), so I have no real experience, but if you look for that section on the www.apache.org website it should help. (Assuming you are using an Apache server)
I have checked my server log files for two years but not a single cgi page is ever indexed.Does querystring creates some problem.Does search engines find some problem to index pages like this /cgi-bin/ubb/ultimatebb.cgi .I am using Ultimate Bulletin Board.My discussion pages contain very valuable information and I want them to be indexed by search engines.
Thanks for your time