Here is a (non-exhaustive) list of traditional code editors that support VHDL, Verilog and SystemVerilog. While there are several dozens or perhaps hundres of editors with support for many languages, including HDLs, this list contains editors that are used by real VHDL, Verilog and SystemVerilog developers for real projects.
By traditional code editors, we mean general purpose text editors that have some support for HDLs. Usually this includes VHDL, Verilog and SystemVerilog syntax coloring and template expansion. Some editors provide some extra features such as code folding and automatically formatting HDL code.
Pricing ranges from free to a few hundred dollars for a perpetual license.
Commercial
Free / Open Source
Special category
Emacs (or XEmacs) is special to VHDL, because of the powerful VHDL add-on (VHDL-mode, in Emacs terminology) written by Reto Zimmerman. This add-on makes extensive use of complex pattern matching to support operations such as instantiating components and fixing sensitivity lists.