Neocities is described as 'Create your own free website, and connect with others you by following their sites. You get 1 GB of space to make whatever you’d like with HTML, CSS, JS, image, text, and web font files' and is a Website Builder in the Development category. There are more than 50 alternatives to Neocities, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, SaaS, Windows and Linux. Most alternatives are Website Builders and Web Hosting Services. The best alternative is GitHub Pages, which is free. Other great sites and apps similar to Neocities are Carrd (Freemium), Netlify (Freemium), UberSpace (Paid, Open Source) and Google Sites (Free).
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.