Sequence Diagram Editor 

Modeling tool that simplifies and speeds up the creation and maintenance of UML sequence diagrams and telecom/wrieless call flow diagrams. It automatically takes care of layout and formatting (across multiple pages if needed).
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Visustin 

Visualize your code with flow charts. Visustin generates a flow graph of code written in VB, VB.NET, VBA, ASP, C/C++, C#, Java, JSP, JavaScript, COBOL, Fortran, Pascal/Delphi, Perl, PHP, T-SQL, PL/SQL and Ada. Review and document your algorithms!
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EventStudio Sequence Diagram Designer 

EventStudio is a CASE tool for Sequence Diagram, Call Flow, Message Sequence Chart, Use Case and Collaboration Diagram Generation. EventStudio goes beyond UML sequence diagram support and supports advanced constructs for Systems Engineering.
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Project Analyzer 

Project Analyzer is a Visual Basic code analyzer, optimizer and documentor. Detect dead code and remove it. Surf your code as hypertext and graphical call trees. Document your work. Supports VB 3-6, VB.NET and VBA.
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SQL Diagrams 

A graphical overview of your database solution. Don't spend hours trying to understand your database, see it with SQL Diagrams. Graphically understand, how your tables, views, SPs, UDFs, triggers and other database objects interact, and more.
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