VHDL 2008/93/87 simulator
Haskell to VHDL/Verilog/SystemVerilog compiler
XLS: Accelerated HW Synthesis
Visual editor for open FPGA boards
AWS EC2 FPGA hardware and software development Kit
Bluespec Compiler (BSC)
Sloc, Cloc and Code: scc is a very fast accurate code counter
Scala based HDL
A general purpose syntax highlighter in pure Go
wxMEdit, Cross-platform Text/Hex Editor, Improved Version of MadEdit
A New Programming Language for FPGA Projects
A Toolkit for Designing Computers
CoolFormat Source Code Formatter
A free cross-platform editor for the DRAKON visual language.
Win32 API wrappers for accessing COM Uart in blocking mode
Electronic design and programming tools suite like Eagle, MpLab
A Development Framework for Coldfire
A graphical Finite State Machine (FSM) designer.