As of 11-24-2014 Office Web Apps Server will be removed from the Microsoft Download Center. At that time it will only be available for download under Volume Licensing agreements. For more information please read the FAQ below or visit the site Volume Licensing Service Center.
Why is Web Apps Server being removed from the Microsoft Download Center?
VLSC is best suited as the location from which to serve all customers according to their agreements with Microsoft.
What about existing installations? Do I need to re-license them?
No. Web Apps Server installations and/or downloads that occur before 11/24/14 will continue to be licensed for free viewing.
Will there be an evaluation version for Developers and IT Pros?
Evaluation availability will continue on MSDN for subscribers. Additionally, Volume License agreements allow for product evaluation.