TurboVB 

TurboVB is an integrated feature packed tool for VB6 - a major enhancement to its IDE. It has over 40 add-ins that will provide you with real productivity gains. Free support and updates and a site licence as standard.
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VB DocuMentor 

Document your programs with one click. VB DocuMentor is a VB 5/6 Add-In that allows you to painlessly document your program as you code it. It produces formatted descriptive procedure and module headers, error handlers and indents.
document headers error handlers track revisions