KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Payable - Easily manage and pay your contractors
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
Kanda - Affirm for general contractors
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
ContractorPlus - Everything home service contractors need in one app.