Maintaining a sitemap is an easy way to boost your site's search engine ranking. However, I've never liked doing it manually. Every tool I found online to automate sitemap generation was either expensive, overcomplicated, or both. The sites I manage are fairly simple so I didn't like recommending paying for feature-rich tools that weren't going to be used to their full potential. My sitemap generator builds compliant sitemaps for any site at the file location specified in the included config file. The generator can be configured to update your sitemaps on a regular basis. Simply add the command to cron. The generator will crawl through your site via hyperlinks and determines page priority by counting how many times a page was linked.