Jens, you can create a solution locally instead of waiting for someone to "build a website".
(Besides, will the searchsite include the exact list of sites that YOU wish to search?)
good results if you visit google search and type this
MYSEARCHTERM site:antix.freeforums.org OR site:forum.mxlinux.org OR site:antix.mepis.org OR site:download.tuxfamily.org/antix
so create a local html page which displays webform textbox & button.
Submitting the webform would POST to google search url, appending the following to your urlencoded search term
alternatively, and quicker / easier:
visit google seach,
paste boot site:antix.freeforums.org OR site:forum.mxlinux.org OR site:antix.mepis.org OR site:download.tuxfamily.org/antix
and BOOKMARK the result
or create a "new custom search engine" within your web browser (firefox)above, "boot" is just an example / placeholder search term
another approach: sudo updatedb && sudo locate search-bar
Examine the existing "searchy shortcut launchers" to learn how you can create a new task-oriented launcher