RVSitebuilder is described as 'Adopted a mobile-first concept, RVSiteBuilder 5.2 is enhanced for PCs, smartphones, and tablets across popular browsers*. The new hundreds of template designs are optimized for mobile device’s view. Once the web is published, the RVSiteBuilder 5' and is an app in the Development category. There are three alternatives to RVSitebuilder for Online / Web-based, Windows, Linux and Mac. The best alternative is Silex, which is both free and Open Source. Other great apps like RVSitebuilder are devhub (Paid) and WebStarts (Freemium).
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.
DevHub is your place to create on the Web with no hosting hassle, guided site-editing, money-making tools, social features integrated, and a whole lot of fun mixed in! Forget run of the mill site-builders, DevHub is an online brand builder.