Here's a PCB design tools list you can download, and more resource for comparing which one software you can choose to use. Get freeware and open source pcb design tools.

• EAGLE - Nice, easy to use CAD/CAM software for PCB schematic and routing. You can download free evaluation version.
• TinyCAD -TinyCAD is a free open-source schematic editor written by Matt Pyne.
• FREE-PCB -FreePCB is a free, open-source printed circuit board layout editor for Microsoft Windows!
• gEDA - gEDA is a free, open-source schematic capture and layout package that runs on Linux.
• ZenitPCB - ZenitPCB is a freeware layout software.
• PCB - Free unix PCB editor.
• KICAD -GPL open source schematic capture and PCB routing.
• TCI3 -Free PCB routing and schematic capture software.
• SCORE - Free schematic capture software (Alfa version).
• PROTEL - CAD/CAM software for schematic and routing. You can download 30 days free trial. Protel offers free old-DOS based software called EasyTrax.
  
• MINIMAL PCB EDITOR - Open source schematic capture and board layout editor for windows by OKADA Hitoshi

More source for freeware and open source PCB Design Tools

See more: Printed Circuit Board Software - WinCircuit 2008

Here's a links list for PCB trace calcultor, calculates the trace width for printed circuit board conductors for a given current using formulas from IPC-2221 (formerly IPC-D-275).

PCB Trace Width Calculator - This Javascript web calculator calculates the trace width for printed circuit boards based on a curve fit to IPC-2221 (formerly IPC-D-275). Also see the via calculator.

ANSI PCB Trace Width Calculator - This page calculates approximations to the ANSI/IPC-D-275 and IPC-2221 design standards for PCB trace width. The approximations and rationale are described in Temperature Rise in PCB Traces

PCB Design Information - Some useful information for designing general-use printed circuit boards.
- PCB Environment
- PCB Base Material
- Trace Width Calculator
- Trace Spacing

 

PCB Trace Amperage Chart Image source

See more: Printed Circuit Board Software - WinCircuit 2008