SHENZHEN I/O - Build circuits and write code in the ultimate electronics engineering game.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Codelink v2 - Codelink v2 is a Next Generation Online Hacking Simulation that offers similar gameplay of the famous game of Uplink: Hacker Elite.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
Oh My Dots - Play free connect the dots, picture maze and AI powered crossword games now. Turn any picture into a dots-to-dots game. Create and share games with you friends without registration.
QUCS - Qucs, briefly for Quite Universal Circuit Simulator, is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit.