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This is a paid asset, but now you can download RemotePackageManager – Asset Bundles Free.
RemotePackageManager – Asset Bundles v3.8
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Easily add support for AssetBundles to your game!
UNITY 5 SUPPORT IS OUT!
It makes it easy to build, load, quickly iterate and even upload AssetBundles right from Unity Editor!
You can checkout the Online Documentation
Join the Forum Thread
Features:
– Total Unity 5 support! [NEW]
– Instantiate a cloud Prefab with no code!
– Download packages, as easy as one line of code!
– Build your AssetBundles with one click! [1]
– Version management handled automatically!
– Manage package dependency visually!
– Upload to Amazon S3 or FTP with one button!
– One click Multiplatform builds!
– Quickly iterate your game as you can load AssetBundles from the editor without having to build them!
– Mobile ready! [2]
[1] If using Unity 4.x, requires Unity Pro license.
[2] If using Unity 4.x, requires respective Unity Mobile Plugin.