phpSitemapNG is described as 'Free Google Sitemaps generator written in PHP, but also generates RSS-based, txt-based and HTML-based sitemap files. It will spider your website and also your filesystem (of course, as you prefer). You can download and use it for free, the licence is GPL' and is an website in the development category. There are nine alternatives to phpSitemapNG, not only websites but also apps for Windows, Mac and SaaS. The best phpSitemapNG alternative is Octopus.do, which is free. Other great sites and apps similar to phpSitemapNG are WonderWebWare Sitemap Generator, FlowMapp, DYNO Mapper and XML-Sitemaps.com.