The companies that create and serve web applications are called Application Service Providers (ASPs).
Note that many of these application service providers (ASP) may offer a licensed version of their content management system.
Note also that these ASP applications should not be confused with programs written in Microsoft Active Server Pages (also known as ASP).
Personal and professional photo albums probably belong in ''Arts: Photography: Photographers'' or ''Business: Arts and Entertainment: Photography: Photographers.''
Photo album software probably belongs in ''Computers: Software: Graphics: Image Cataloguing.''