CSS Tab Designer is described as 'unique and easy to use software to help you design css-based lists and tabs visually and without any programming knowledge required!' and is an app in the Development category. There are three alternatives to CSS Tab Designer for Windows, Chrome OS, Mac and Online / Web-based. The best alternative is SWIMBI - Swift Menu Builder, which is free. Other great apps like CSS Tab Designer are CSS Menu Builder (Free) and CSS Menu Generator (Free).
SWIMBI - fast and easy way to create a nice looking CSS menu for your website. Pick one of 70+ ready-to-use menu skins, change names and links, click "Publish" and you are done. Creates standards compliant menus using modern technologies, HTML5, CSS3, Canvas.