Free CAD Software - ExpressPCB Start by downloading our NEW free CAD software ExpressPCB Plus! It includes ExpressSCH Classic for drawing schematics and ExpressPCB Plus for circuit board layout. Both programs are completely free, fully functional and easily installed with a single InstallShield setup program. Learning to use our software is fast because of its standardized Windows user interface.Expresssch · Release Notes · ExpressPCB Plus Circuit Diagram Software, Circuit Diagrams | Aventics The Scheme Editor software is available to you free of charge and allows you to intuitively create pneumatic circuit diagrams. This software helps you create standardized pneumatic circuit diagrams, from simple designs to complex projects. CAD skills are not required.