UniClip 5.3.3 for Mac was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. UniClip for Mac lies within Productivity Tools, more precisely Office Tools. This free software for Mac OS X is a product of FootWare Apps. Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe.
From the developer:
UniClip is a universal clipboard application that makes the copied information available on multiple devices. This program prevents you from sending text messages or e-mails to yourself, as you can paste text from your clipboard on one device - Mac or iOS - and instantly find it available on another.
You may want to check out more software for Mac, such as PDFMergeThing, Apimac Clean Text or Gordon, which might be similar to UniClip.