Visual Basic Upgrade Companion
The Visual Basic Upgrade Companion is the best tool to efficiently migrate Visual Basic 6 code to .NET (VB6 to VB.NET & VB6 to C#).
The Mobilize Assessment Wizard is a powerful source code analyzer which runs on your desktop and is available for Windows. It comes with built-in support to analyze C#, PowerBuilder and VB6.
Informix Line Counter
A simple command-line tool that you can run against your Informix 4GL applications to determine the total lines of code and some other basic characteristics.