From RS Components:
Free from practical constraints on board size, pin counts, layers and output types, DesignSpark PCB circuit design software can be used for schematic capture, PCB design, layout and generating manufacturing files. Multi-page schematic designs are supported and gerber (extended) file outputs allow the designer to choose who will manufacture the board. DesignSpark PCB supports the importing of Eagle CAD design files, circuit diagrams and libraries (See the Eagle import tutorial for further information). A comprehensive standard parts library is supplied, which can be amended, copied and added to as required and sophisticated part creation wizards make it easy to Design new parts from scratch or by amending standard symbols and footprints. Bill of materials (BOMs) reports can also be generated at any time; these give RS Components order numbers where appropriate. DesignSpark PCB is offered completely Free of Charge and fully featured. This is not a cut down version of an expensive product or one with a time limitation on license. (There are no intentional limitations on designs). There are unlimited schematic sheets per project, up to 1m squared of board size and no limits on layers, which allow you to get your creativity flowing without restraints. DesignSpark PCB allows you to generate all the files required to take your project from circuit diagram to layout schematic to a circuit board built project. Gerbers (Extended RS-274-X), Excellons, BOMs, component lists and positions are possible along with DXF (import and export) and IDF for interfacing to mechanical CAD software tools. Whether you are a professional designer making money from your designs, an electronics education professional, a student or a hobbyist seeking an easy to use, professional standard, unrestricted schematic capture and PCB layout tool, then DesignSpark PCB is right for you.
Spice Simulation Interface. DesignSpark PCB software can now be interfaced to free industry standard Spice simulators to carry out circuit simulation. DesignSpark PCB Circuit Design Software currently supports four simulators: LTSpice, LSSpice, B2Spice and TINA.
You can select tracks or vias (vertical electrical connection between different layers of conductors in a PCB) in your design and perform basic electrical calculations such as...
1) Width of a track required for a given current.
2) Impedance of a selected track.
3) Optimum copper density to use.
4) Approximate temperature rise on a track.
5) Resistance of a via given its physical characteristics.
These useful calculators produce approximations of actual circuit performance to aid the decision process in completing a successful PCB layout. Also available is a standard scientific calculator.
Grouping. This feature allows multiple items in your circuit diagram to be associated together so that they act as one 'unit'. Once defined, groups can be used to assist in selecting related portions of your circuit. Perform group functions from the Schematic to the PCB to enable simpler identification and handling of specific elements of your design.