File: https://www.inboxsdk.com/build/inboxsdk.js
Then I see the github page: https://github.com/InboxSDK/
There is no InboxSDK project but, just two example chrome plugins using the inboxSDK.
All the trappings and mechanics of open source without the actual source and an actual open source license. Are you guys just testing this to see if you can productize it? Or are you going to go all the way and open source this?