Unfortunately Spiceworks is Windows-specific, so while it might work for someone else, it won't be suitable for me.

I need something that's going to be installed on a web server, likely running some linux distro.
Is it? Since I need to install it on Windows Servers I did not look into other supported platforms and I may not recall correctly, but Spiceworks has its own internal webserver (optionally, so, you don't have to use IIS), and I am fairly sure it supports MySQL besides Microsoft SQL Server. I really thought it was multi-platform.
Again, I may recall wrongly.