Hello,
If you done all the custom development using WSP then go to SharePoint Central Admin and select the Operations tab-->Select Solution Management.
Here you can see all the WSP package lists.
If you are not sure about WSP package then go to C:\inetpub\wwwroot\wss\VirtualDirectories\select your web app port\web.config.
Now see all the safecontrol entries of your custom webpart or page.
Hope it could help
Hemendra: "Yesterday is just a memory,Tomorrow we may never see"
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