Is there an open source or other equilvent to Android Sync Manager? I am looking any suggestions of an an open source package or web software that I can manage both my Android devices (Galaxy 10.1 tab/Galaxy S Smartphone.  My computer OS is Ubuntu.  I want to be able to back up my devices and manage my files on my PC. I have tried Airdroid with limited success.  I current have the ability to view and manage my devices as data store devices.
If you are just talking about files, I'd take a look into FTPSyncX or FolderSync. I can only talk for FTPSyncX, as I am using it myself -- but most of the following should be valid for both apps:

You can setup directory pairs (one on your device matching another on your PC), and have them sync bidirectionally or unidirectionally. You can configure the sync interval: globally, per server, or even per directory-pair. You can even tell it to only sync when you're in your Home WiFi, or only when you request it (via Widgets, from within the app, or even event-based controlled by Tasker.

If this answer didn't catch your intention, feel free to comment, ask, or update your question :)