QElectroTech - QElectroTech is a free software to create electric diagrams.
Numi App - Numi is a beautiful text calculator for Mac.
EPLAN Electric P8 - CAE software solution for project planning, documentation and administration of electrotechnical automation projects.
SpeedCrunch - SpeedCrunch. SpeedCrunch is a high-precision scientific calculator featuring a fast, keyboard-driven user interface. It is free and open-source software, licensed under the GPL. Download Documentation Donate .
PCB Droid - PCB Droid is an amazing mobile app that allows you to design printed circuit boards for your DIY projects.
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.