The Insitute of Environmental Engineering (IFU) and Institute of Geodesy and Photogrammetry (IGP) at the ETH Zurich opens the source of the three-dimensional Particle Tracking Velocimetry (3D-PTV) software for academic use. Everyone can request it by sending an e-mail. URAPIV greets every open science project and especially open source ones. In addition, Alex has opened a Wiki for all PTV users that it is edited collaboratively to promote the code and improve it's documentation. Wiki will have also some more codes for the post-processing, turbulent flow analysis, etc., written for years in C, C++, Matlab. Wiki looks nice and we consider to move URAPIV there too :-). It will allow all our users to edit it's documentation, which is still missing - sorry for that.