wxMEdit, Cross-platform Text/Hex Editor, Improved Version of MadEdit
The allRound pocket sized CodeEditor.
A Toolkit for Designing Computers
Powerfull pre-processor
A graphical Finite State Machine (FSM) designer.
An HDL alternative to PCB graphical schematic capture tools.
Open Source Hardware For Industrial Automation
Bluespec SystemVerilog Eclipse Plugin
VHDL Design Tool - code generation and project management