Tools for Designing PCBs:
Cadence allegro is a scalable, proven PCB design environment that addresses technological and method¬ological challenges while making the design cycles shorter and predictable.The PCB design solution contains everything needed to create a PCB layout with a fully inte¬grated design flow. The base— Allegro PCB Designer—includes a common, consistent constraint management solution, PCB Editor, an auto/interactive router, as well as interfaces for manufacturing and mechani¬cal CAD. PCB Editor provides a complete placement and rout¬ing environment—from basic floor planning, placement, and routing to placement replication and advanced interconnect planning—for simple to complex PCB designs.
PADS, Mentor Graphics’ world-leading desktop PCB design tool, enables you to develop PCBs within a highly productive, scalable, and easy-to-use environment. PADS solutions cover the spectrum of PCB development, from schematic entry to manufacturing preparation. But, unlike other products, we’re not ‘one-size-fits-all.’ With PADS you buy what you need. PADS Suites, available in three configurations, are our newest solutions, tailored to meet the design needs of each individual. Major Benefits: • Proven, reliable PCB design technology • Powerful, yet easy-to-use • Scalable to grow as your requirements grow • Advanced capabilities to tackle complex design problems with accuracy and ease • Offers capabilities for highspeed, thermal, and power integrity analysis, analog and RF design, FPGA to PCB optimization, manufacturing prep, and more
Altium Designer is an electronic design automation software package for printed circuit board, FPGA and embedded softwaredesign, and associated library and release management automation. It is developed and marketed by Altium Limited of Australia. It is an EDA software solution that provides the designer with the tools they need to solve engineering problems and create the electronic devices that change the world. Some of the features are • Support for Flex and Rigid-Flex Design • Enhanced Layer Stack Management • Board Design Enhancements • True Variant Support
CADSTAR is a Windows based EDA software tool for designing and creating schematic diagrams and printed circuit boards. It provides engineers with a tool for designing simple or complex, multilayer PCBs. CADSTAR spans schematic capture, variant management, placement, automatic and high-speed routing, signal integrity, power integrity, EMC analysis, design rule checks and production of manufacturing data. The basic features of CADSTAR can be tested with the free version of CADSTAR Express  or Schematic and PCB files produced by CADSTAR can be reviewed using the CADSTAR Design Viewer.
EDA Software :
KiCad is an EDA software suite for the creation of professional schematics and printed circuit boards up to 16 layers. KiCad runs on Windows, Linux and Apple OS X and is released under the open-source GNU GPL v2 free of charge. With KiCad you can create schematic diagrams and printed circuit board up to 16 layers. KiCad comes with a rich set of libraries with 3D models as well. KiCad is a mature EDA software tool under active development by a team of developers and a vibrant user group. KiCad team counts three main developers and a dozen of regular contributors.