Every electrical engineer who does DIY projects knows that dozens of free resistor calculators are out there that can save quite a bit of tedious work. Other simple tools can be found, but traditionally the free tool arsenal would stop there. Sure, there are base platforms such as SolidWorks and Autodesk, but what happens when they are missing a feature needed at that exact moment?
Now we're seeing a relative explosion in free tools for engineering electronics. It is easy just to hit the Net and use the myriad resources available. Some of those online tools prove to be worthless, and it's back to blind searching or some paid tool. But free software extends far beyond the functionality of a simple calculator.
To help sort out the nonsense from the useful online tools, check out the following list.