ActiveError Foundation
   Every function or procedure is treated like a transaction, just like in SQL Server or Access. Through this feature, Foundation can "reexecute" your code, restor-ing it in exactly the state it was in before the error occurred. Foundation lets
   http://www.cirkadia.com/ActiveErrorProductOverview.html

Advanced Imagery Library (AIL)
   A set of COM DLL's, Visual Basic modules, and Visual Basic classes give the ability to load, examine, manipulate, resize, and/or save pictures in different formats. [Commercial]
   http://www.advimglib.com/

AxTools
   Provide add-ons and tools to Visual Basic 6.0 and VB.NET includes CodeSMART, EasyPatch, Source+, AxFormExtender.
   http://www.axtools.com/

CodeColorizer
   Convert your source code to colorized (syntax highlighted) HTML documents. Colorized source code is easier to read and can help to document, learn, understand, debug, print and publish source code.
   http://www.chami.com/colorizer/

Digital Lenz - Code Generators & VB Developer Tools
   Are providers of Microsoft Visual Basic developer tools and software to increase developer productivity including source code documentation, automatic code generators, documentors, and standards checking.
   http://www.digital-lenz.com/

Entisoft Tools
   A function and data structure library for Microsoft Visual Basic and Office developers.
   http://www.entisoft.com/ESTools.htm

HALLoGRAM
   Shop of Visual Basic tools.
   http://www.hallogram.com/menus/Visual_Basic.html

PrettyCode.Encoder
   This tool colors your Visual Basic and VB.NET code in HTML format. Advanced options enable you to add line numbers, change default auto-indenting options, your custom colors.
   http://www.vbcity.com/encoder/

SoftWIRE
   A Graphical Extension to Visual Basic by SoftWIRE Technology, Inc. It combines both graphical and syntactical programming within Visual Basic. All SoftWIRE control blocks are COM/ActiveX compatible.
   http://www.softwiretechnology.com/

VB Branding
   A 32-bit brandable application SDK for Visual Basic 6.0.
   http://www.vbbranding.com/

VB6ToVC6
   Visual Basic 6 to Visual C++ 6 sources converter. [Open source, GPL]
   http://sourceforge.net/projects/vb6tovc6/

VBDOX
   Simple tool for creating technical (API) documentation in HTML format from Visual Basic source code, VBScript or ASP pages comments. Itself written in visual basic and allowing external documentation generators and comment parsers.
   http://vbdox.sourceforge.net/

VBGuard
   An error detection and debugging tool for Visual Basic developers. Intercepts run time and programming errors before they crash your program, keeping your code clean and users happy.
   http://www.andreamaldini.it/VBGuardSite/

VBShop
   Tools and tips for Visual Basic programmers.
   http://www.aivosto.com/vb.html

VBto Converter
   Utility for converting MS Visual Basic 6.0 forms to resource and source files MS VC++, MS VBNET, MS CS, Borland C++ Builder, Borland Delphi.
   http://www.vbto.net

Visible Progress Technologies
   Offers quality assurance tools and services for Microsoft Visual Basic 6 and Visual Basic .NET source code, enabling automated code reviews and effective Visual Basic coding standards enforcement.
   http://www.visibleprogress.com/

Visual Code Scan 6
   Scan Visual Basic 6 projects for dead code, unused and undeclared variables, and functions with no return type. Plus other helpful tools.
   http://windsweptsoftware.com/codetool/vcs6.htm

Visual DLL
   The DLL Construction Kit for Visual Basic. By Simply Solutions Software Development Corporation.
   http://simplysolutions.com/

Visual Expert
   Explore, understand and maintain VB and PowerBuilder applications: Impact analysis, automatic technical documentation, code cleaning, exploration of the links between objects.
   http://www.visual-expert.com/

WIN32 API Type Library for VB Developers
   By Infotomic Software. [Commercial]
   http://www.infotomic.com/

beWise - Edelwise Basic Variables
   Component providing Task-To-Task communication for Visual Basic Programs simply via variables. Available as commercial product and, in a limit version, as Freeware.
   http://www.edelwise.com/products.html