BlockZilla vs CmisSync

All-in-one solution to get rid of all the promoted tweets, sponsored posts, and ads.

BlockZilla is a browser extension that declutters your social feeds from sponsored content. Twitter, Facebook, LinkedIn, Reddit, and many more. No more promoted tweets, no more sponsored posts, and ads.

Location: Sofia, Bulgaria

Synchronize documents between your computer and your enterprise file server (Alfresco, SharePoint, Documentum, any CMIS-compliant server)

It is like Dropbox for Enterprise Content Management!
For file sharing/synchronization, don't get a new server or rely on the cloud: just use your existing document management server.
Free and open source.