SplineTech VBS Debugger
SplineTech VBS Debugger is a unique software development tool that enables you to easily edit and debug . VBS files (VBS scripts). Native support for JavaScript, Jscript, VBScript and Windows Scripting Host (wscript).
http://www.RemoteDebugger.com/vbs_debugger/vbsd.exe - 577Kb - Download - Screenshot

VbsEdit
Vbsedit is an award-winning VBScript editor that dramatically reduces the time you spend writing . VBS scripts. VbsEdit has an integrated debugger that make troubleshooting a seamless experience. The editor displays the values assigned to variables during debugging. ... Vbsedit support syntax coloring and can display line numbers. ... Vbsedit generates WMI scripts for you (like Scriptomatic). ... The Object Browser allows you to examine and discover WMI classes and objects used in the current script and their members.
http://www.vbsedit.com/vbsedit.exe - 4Mb - Download - Screenshot