Zanzibar is an AddOn for the Skype for Business-Client. With Zanzibar you can transfer calls very easily - with a single mouse click!
Universal Call Pickup is a pure server-centric application for Microsoft Lync, which allows users to comfortably pick calls. Software installation on the client is not necessary.
Zanzibar works fine with all Client versions, means Lync 2010 - SfB 2016. So you'll be perfectly prepared for future challenges.
All the listed call transfer features will be available for everybody...for free...forever!