Classic Google Sites is described as 'makes creating a team or company web site as easy as editing a document. Quickly add text, videos, calendars, presentations, files, and more, and then easily share this information with your organization or the world' and is a popular Website Builder in the Development category. There are more than 100 alternatives to Classic Google Sites, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, Linux, SaaS and Windows. The best alternative is MediaWiki, which is both free and Open Source. Other great sites and apps similar to Classic Google Sites are Webflow (Freemium), Squarespace (Paid), Neocities (Freemium, Open Source) and Weebly (Freemium).
MediaWiki is a free software wiki package written in PHP, originally for use on Wikipedia. It is now used by several other projects of the non-profit Wikimedia Foundation and by many other wikis, including this website, the home of MediaWiki.
Known is a simple platform for publishing words, pictures, podcasts and more to a site that you control. Choose to share it on social networks like Twitter and Facebook, or extend it to integrate with the software you already use.
Silex, is a free and open source website builder in the cloud. Create websites directly in the browser without writing code. And it is suitable for professional designers to produce great websites without constraints. Silex is also known as the HTML5 editor.
Carrd is a free service for building and hosting simple, responsive, one-page sites for anything; a personal "business card" style site or a "coming soon" page with a Mailchimp signup form to capture emails.
Where programmers share ideas and help each other grow. It is an online community for sharing and discovering great ideas, having debates, and making friends. Anyone can share articles, questions, discussions, etc. as long as they have the rights to the words they are sharing.