KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Procore - Procore is the world's most widely used construction project management software. Easy to use, mobile platform with unlimited user licenses.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
Corecon - Corecon offers integrated estimating, project management, and job costing for small to medium-sized construction companies.
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.
PlanGrid - The #1 construction app. Used by thousands of companies to save time, money, and ditch paper plans forever.