W3DIR is described as 'web directory powered by humans. Users and webmasters can search and submit their websites quickly and easily' and is an website. There are four alternatives to W3DIR, not only websites but also apps for SaaS. The best alternative is Curlie Directory, which is free. Other great sites and apps similar to W3DIR are KnowledgePicker, Best of the Web Directory and LinkDir.
Community-driven catalog of learning resources. Links to resources are organized by topics (broad to specific) and rated/reviewed by users so you see which ones are the best. It's free and open for everyone.