Asana vs CmisSync

Asana is the easiest way for teams to track their work—and get results.

Asana is the easiest way for teams to track their work and get results. From tasks and projects to conversations and notifications, Asana enables teams to move work from start to finish. It’s simple to get started, but powerful enough to run your entire business. And it’s free.

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.