SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.
DYNO Mapper - Create Sitemaps with the DYNO Mapper Visual Sitemap Generator.
Lumar - (Previously DeepCrawl) Hosted SEO spider to analyze and find problems with websites.
A1 Sitemap Generator - A1 Sitemap Generator has been in active development and sold since 2005.
Website Checker Tech - WebsiteChecker.Tech is SaaS tool that detects SEO and availability issues of your website, making it easier for you to fix them.
XML-Sitemaps.com - Free Online Google Sitemap Generator.