Search engines happen different. The some search engines demand registration, others demand payment for addition of the reference to your site. Below I show the list of the free-of-charge search engines which are not demanding registration. Addition in them of the site is reduced to a minimum and does not borrow a lot of time.

The list is in constant updating. If you know other search systems where it is possible to add the site without registration and without any payments send me references to these sites through the form here, please.