Drawlogix is described as 'complete professional tool for the design, development and simulation of electronic circuits. Is extremely easy to use and offers optimum integration functions to focus solely on the design aspects of the work' and is an app in the Education & Reference category. There are more than 10 alternatives to Drawlogix for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and Chrome OS. The best alternative is Circuit Simulator, which is both free and Open Source. Other great apps like Drawlogix are QUCS (Free, Open Source), Xcos (Free, Open Source), OpenModelica (Free, Open Source) and SimulIDE (Free, Open Source).
The Quite Universal Circuit Simulator (QUCS) is an integrated circuit simulator allowing the simulation and graphical presentation of results of large-signal, small-signal and noise behavior in circuits.
SimulIDE is a simple real time electronic circuit simulator. It's intended for general purpose electronics and microcontroller simulation, supporting PIC and AVR. PIC simulation is provided by gpsim and avr simulation by simavr.
This electronic circuit simulator is highly interactive giving the feeling of playing with real components. It's very helpful for experimentation and visualization. It's a desktop version of the Circuit Simulator.
The gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production.
It is a circuit simulator on a virtual breadboard. it supports virtual components like microcontrollers, TTL, graphical and alphanumerical LCDs and others in addition to virtual instruments and certainly the basic components (resistors, capacitors..).
Cross-platform software for Veroboard (stripboard), Perfboard and simple 1-layer or 2-layer PCBs. Connectivity checking & visualisation. Netlist import. Interactive auto-routing. Component editor. Gerber output, or PDF for toner transfer. Tutorial.
Ngspice is a mixed-level/mixed-signal circuit simulator. Its code is based on three open source software packages: Spice3f5, Cider1b1 and Xspice. Ngspice is part of gEDA project, a full GPL'd suite of Electronic Design Automation tools.