Open source web application for viewing .ics calendars

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Why not Django?

A model consisting of all the parameters (build number, filesystem location, name, and so on), and use built-in admin to edit and add those objects (or do it programmatically with a build script). Extend the built-in user object, wrap some generic views (object_detail, object_list) to display the list(s) of your products, etc. A simple join is all you need to display the list of products per user, which is abstracted with a decent ORM (or, use SQLAlchemy, if that's your bag.)

That's just an elevator pitch of how I personally would go about it. Django is designed to be "batteries included", so you'll find that most things (tedium you wouldn't really care about much for this application, really) are all set to go. User authentication, admin panel, etc.

It's Python, so I'm unsure if that's your skillset. However, I think it would be a solid tool for the job, given the information provided. If you're a fulltime sysadmin, I highly recommend learning it.