The best free CAD alternative to CircuitLab is KiCad, which is also Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to CircuitLab and three of them are free CAD Software so hopefully you can find a suitable replacement. Other interesting free CAD Software alternatives to CircuitLab are EasyEDA and Circuit Solver Web.
KiCad is an open source software suite for electronic design automation (EDA) - designing schematics of electronic circuits and printed circuit boards (PCB). KiCad is developed by Jean-Pierre Charras. And features an integrated environment between schematic capture, bill of...
Schematic capture, Ngspice based simulation, PCB layout, custom PCB manufacturing, for electronic engineers, educators, students and hobbyists.
Circuit Solver is an electronic circuit simulator. You drag your electrical components and place them on one at a time. You hook up some sources and you place some meters to read the values.
China
Free and huge custom libraries