Drupal is one of the most search engine friendly content management systems available. Out of the box, drupal allows you to set page heading (h1 titles), menu titles and descriptions, and URLs for each page. With some extra community generated modules, drupal also allows you to manually create page titles (<title></title>) and meta tags on a per page basis as well as specify general formats.
Notice in this page, the title tags say "Drupal is Search Engine Friendly", the heading says "Search Engine Friendly", the meta description is "Drupal lets me create a meta description.", meta keywords "Drupal, meta, seo, search engine friendly", and finally URL "drupal/search-engine-friendly.htm".