  We present TURB-Lagr, a new open database of 3d turbulent Lagrangian
trajectories, obtained by Direct Numerical Simulations (DNS) of the original
Navier-Stokes equations in the presence of a homogeneous and isotropic forcing.
The aim is to provide the community interested in data-assimilation and/or
Lagrangian-properties of turbulence a new testing-ground made of roughly 300K
different Lagrangian trajectories. TURB-Lagr data are influenced by the strong
non-Gaussian fluctuations characteristic of turbulence and by the rough and non
differentiable fields. In addition, coming from fully resolved numerical
simulations of the original partial differential equations, they offer the
possibility to apply a wide range of approaches, from equation-free to
physics-based models. TURB-Lagr data are reachable at
http://smart-turb.roma2.infn.it
