Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
Google Sheets - Synchronizing, online-based word processor, part of Google Drive.
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.
LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.