Schematic circuit editor for VLSI and Mixed mode circuit simulation.
LDraw™ editor for LEGO® style digital building instructions.
SwiftLaTeX, a WYSIWYG Browser-based LaTeX Editor
OS bootable from Linux,Windows and others partitions as auxiliary OS
A Text Editor - Modeled Off Editor Within ISPF / SPF / PDF
Electronic design and programming tools suite like Eagle, MpLab