RubySketch is a company that offers PlusSpec, a design and construction software solution that integrates with SketchUp. The software is tailored for architects, builders, and designers, providing features that facilitate 3D modeling, BIM (Building Information Modeling), and VDC (Virtual Design and Construction) processes. PlusSpec aims to streamline the design and construction workflow by enabling users to create detailed, accurate models and conduct virtual walkthroughs, estimating, and clash detection. The company emphasizes ease of use and functionality to cater to professional needs in the construction and design industries.