Disclaimer: I'm the author of Clipbrd
Here's a tool that I've build together with my friend:
It allows you to sync the clipboard between Android and any computer capable of running Chrome browser (e.g. Linux, Mac OS X and Windows).
If you wish, you can just leave Android app out and sync clipboards between different computers, all you need is Chrome running in background.
You don't have to be in the same wifi network, you just need an Internet connection; clipboards are securely encrypted using your password, so that nobody else (myself included) can read them.
It is still an early beta, so please let me know you have any questions or troubles with it.