Chocofur Model Manager is free Blender Addon significantly speeding up the process of using external Blender assets in your projects. Within just a few clicks you can add multiple different objects and materials without even leaving the 3D Viewport space. 

Complete documentation can be found here.

Feature Overview:

► Browse and add 3D assets inside Blender

► Dynamic asset categories / subcategories

► Append / Link assets in scene's Center / 3D Cursor

► Custom assets library path for local and network uses

► Automatic Cloud update from Bitbucket

► Supports custom 3D models and assets

► Foldable menus for cleaner look

► Free to download and use!

► Shared under CC0 license

► Works on Windows / MacOS / Linux

► Blender 2.79 (official build) ready