EditPlus
Offers two Editplus files that assist with Miva coding

Zurnet.com: Miva Toolbars for Allaire's HomeSite
Freeware Miva script and Miva database toolbars for Homesite 4.x by Matt Zur.

NoteTab Clip Libraries
Miva clip libraries for use with Notetab

Textpad Clip Libraries
Includes a Miva clip library for Textpad contributed by Jonathon Wray.

w-3productions.com: MvCoder
An HTMLScript/Miva editor for Windows 95/98/NT. Allows quick access to often-used functions.

Paper City Software
Home of MvTools, a custom text editor, designed for Miva developers. Allows one-click access to script testing.

MarlboroughOnline.co.nz: Miva Tags for Dreamweaver
A Dreamweaver XML tag definition for Miva.