Open source gallery from a Microsoft ISV? You bet.
100% .NET
100% GPL Open Source
Put a gallery on your intranet, internet, extranet, or what-have-you-net

A stand-alone installation of Gallery Server Pro. It can also be integrated into
your existing web site.
Gallery Server Pro is a robust, highly scalable, commercial-grade gallery that
can be installed on a standard server running IIS and .NET with no additional
requirements. Data is stored in a self-contained SQL CE database file.
For the ultimate in performance and reliability, Microsoft SQL Server is
also fully supported.
Gallery Server Pro has a rich, AJAX-enabled UI to let you easily accomplish
complex tasks. But the pages are light enough to be blazingly quick over the
internet.
There is aggressive caching of objects to drastically reduce calls to the database
server.
Easy to install

The web-based Install Wizard makes installation a snap.
Get started quickly with the simple three-step installation:
- Copy files to a directory in your web site
- Configure directory as an application in IIS.
- Run the Install Wizard at default.aspx?g=install
That is it! Your gallery is ready to go. Start uploading media files with the
Upload Wizard or give it a UNC-accessible location of your existing files and
Gallery Server Pro will automatically synchronize to its contents.
Active Directory integration

Integrate your Active Directory users with Gallery Server Pro with a little
editing of web.config.
You can configure Gallery Server Pro to use your existing accounts in Active
Directory. Woo HOO! Crack open the Skittle-brau and pretzels!
Detailed, step-by-step instructions are in the Administrator's Guide.