Yootheme is a premium theme (template framework) for WordPress and Joomla. It has been around and evolving since 2007. According to the company it has 150,000 users, who have used this template on one or more websites.
In 2013 the team behind Yootheme launched their own open source front-end framework, called UIKIT. This framework is a serious competitor to Bootstrap and others, to a degree that is mentioned frequently as one of the top five user interface frameworks.
Being based on the home-made UIKIT, Yootheme has a very firm ground and is being rapidly developed to include the latest advancements in the fields of web-development. The other advantage is working with both Joomla and WordPress community of developers, the framework is being fed by reflections and needs from both communities. This also opens my hands as a Yootheme developer to choose between the two CMS systems, according to the needs of the client.
Since Yootheme 2.0, the developers can load the template with dynamic content. What does it mean? I can keep the complexities of the Yootheme in the background, using it to design page-templates, and make the administration interface much simpler for my clients. So, it does what a real Premium template should do, which is allowing to completely separate the content from design. Aside from simplifying the content management for the clients, it has many more technical advantages, such as the ability to change many pages by editing one template.
UIKIT, and on top of it YOOtheme Pro are mobile-first templates, meaning that they are constructed from the beginning to look well and fast on mobile devices. The layouts and elements follow an intelligent logic to adapt to other screen sizes.
In compare to many other famous templates and front-end frameworks, UIKIT can be called minimalistic, yet I think this label is not enough to value the beauty of their code. That is why the term artistic sounds more just. While being simple, the code base and its logic offers the developers many possibilites to create beautiful and efficient designs. It significantly reduces the time of development, so more time can be focused on other aspects.