ViSP 3.1.0 release is out. It includes a lot of improvements and bug fixes.
Big thanks to everyone who participated!
The changes are summerized in https://github.com/lagadic/visp/blob/3.1.0/ChangeLog
The packaging for iOS is already done.
The packaging for OSX, Debian, Ubuntu, Arch Linux and ROS indigo/jade/kinetic/lunar is under way.