This was a tool I created at Pokelabo. The code is proprietary but I can share the how-to video. Skip to about 2:20 for the cool parts!

Problem: We have a ton of assets that we could reuse between different games, but no good system for searching, cataloguing, and sharing them. Copying them from one Unity project to another is a huge pain. Getting them from version control (git) provides no visual feedback.

Solution: 3DAMS. It comprises:

• A Unity editor script, which allows the user to select assets to store. It then categorizes the asset by type (particle system, material, texture, mesh, sound, etc.) and automatically FTPs them to the cloud.
• A web frontend which allows the user to input additional cataloguing information (which game is it from, who made it, what element is it, etc).
• The web frontend also includes a viewer environment for previewing assets.
• A database which stores the unity packages, thumbnails, and exported metadata.
• The web frontend allows searching by this metadata, as well as editing and deleting the entries.

The Unity editor script was created in C# and contains various hooks to the user environment (FTP scripts, the browser). The web frontend uses HTML, CSS, and asynchronous Javascript to retreive info from the backend. The backend is built with PHP and MySQL, and runs on the company cloud.