XML-Sitemaps.com is a free online service that generates an XML sitemap for a website, which can be submitted to Google, Bing and other search engines. No registration is required; users enter a website link and get a sitemap for up to 500 pages, then download the sitemap files. It also prepares an HTML site map and a text sitemap.
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An advanced search page for YouTube videos that offers filters for duration, date, title and more. It notes that if YouTube ignores the search filters, users can try Google Videos for better results. The page also includes a playlist section with a running count of selected videos.
MW Metadata gathers metadata about a YouTube video, playlist, or channel from the YouTube API. Users submit a link or ID, and the tool supports reverse image search of thumbnails, geolocation in Google Maps, and translation of ISO country and language codes. Results can be exported as a zip file or shared.
YT Video Essay Hall of Fame is a public Google document or spreadsheet containing organized links, notes, data, or resources.
ZArchiver is a program for archive management with a simple and functional interface. It works with various archive types, including 7zip, zip, bz2, gz2 and tar. The site notes that purchasing applications through Google Play is currently unavailable indefinitely.