The original version of XenPorta 1.0 was released a short four days after the open beta of the XenForo platform. It was created in order to fill the needs that people had with the platform and the lack of a front-page for their forums. XenPorta was released for free, because I was new to the platform and didn't feel comfortable charging for an under-produced and impossible to support piece of software. Some time later, I released XenPorta 1.5, which tacked a rudimentary widget framework onto the existing XenPorta 1.0 software.
XenPorta as it stands now is the most popular XenForo addon ever released. If you include the two years it was out before the implementation of the XenForo Resource Manager, it has been downloaded more times and has more response posts than any other addon. As such, I have in the past been unable to support XenPorta; especially since it was free.
It is now over 3 years later and I have learned so much about XenForo and the Zend platform... to the point that I have begun releasing premium, and fully supported versions of my software. However, since XenPorta is my oldest, and most popular software released yet, it requires the most amount of work to rewrite. Unfortunately, with the amount of work that is going to be required to rewrite XenPorta, development can not continue without proper funding.
Discussion thread on the crowd-fund: