Elvis is a clone of vi/ex, the standard UNIX editor. Elvis supports nearly all of the vi/ex commands, in both visual mode and ex mode. Elvis adds support for multiple files, multiple windows, a variety of display modes including "hex" and "html", on-line help, WYSIWYG printing, and other miscellaneous extensions.
VTAGS is a command line application that will generate a VI(M) compatible tags file for VHDL source files. This application will read standard VHDL'87 files. It should also parse later VHDL, but it only takes account of the basic parts of the language. It will group items that it finds by architecture, procedure, function, or package. It does this by adding extra information to the extension field of the tags file.