Wolvin's Simple Personal SourceSDK UI
This is my very old program that helps manage & aimed to your Source SDK mapping purpose. Including Workshop Tool for Garry's Mod. However, this is old Application which require Visual Basic 6 RunTime to be installed (Redist. included).
Please note that use at your own risk. This program is no longer updated/maintained. Usage for Legacy Source SDK purpose only! (tho, I'm still using it for Garry's Mod mapping anyway)
WolvinSDK/Workshop Uploader Tool download