VHDL and Verilog IDEs

In the last few years, several stand-alone integrated development environments (IDEs) for VHDL have been developed. Borrowing the concepts from software IDEs (Borland, Visual Studio, etc) these IDEs provide direct feedback about the code, and integration with simulators and/or synthesis tools.

Sigasi available commercially and as a free VHDL editor; full VHDL support, limited Verilog, price under $1000.
Mentor HDL Designer (high-end design creation, price over $10k)
SimplifIDE (available for free – no longer maintained)

In addition to these commercial IDEs, there are some experimental, academic open source VHDL editors and Verilog editors. They are all based on the Eclipse platform.

These projects can be used as Eclipse free VHDL/Verilog plugins, but may lack stability and maturity.

Veditor, open source VHDL eclipse plugin. Beta. EPL License
Signs, academic eclipse IDE, synthesis and simulation. Experimental. BSD License
ZamiaCAD, academic research project, successor of Signs, GPL License

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VHDL Editors - Verilog Editors

VHDL and Verilog IDEs