Electrical circuit tool. It is also easy to navigate with sufficient options available for optimum circuit design. Circuitlab provides online in browser tools for schematic capture and circuit simulation. It can be used to simulate power electronics circuits with electrical and electronic components. It is still a new simulator so that there are few components to make simulations for choices.
Its good at spice simulation. A good tool allows you to build designs and checks for problems with the design at regular intervals. Easyeda is a free and easy to use circuit design circuit simulator and pcb design that runs in your web browser. A wide list of components are available in this circuit simulation tool.
All these and many more features are available in todays eda tools but often these tools cost a lot for. You can draw electrical circuits and test it. Electronic circuit simulation software partsim is an electronic circuit simulator online. Partsim is a free and easy to use circuit simulator that includes a full spice simulation engine web based schematic capture tool a graphical waveform viewer that runs in your web browser.
These tools allow students hobbyists and professional engineers to design and analyze analog and digital systems before ever building a prototype. A circuit design software forms a very essential part of an electronics engineers life.