The evolution of young stars and disks is driven by the interplay of several processes, notably accretion and ejection of material. Critical to correctly describe the conditions of planet formation, these processes are best probed spectroscopically, using the emission lines, and the UV to IR continuum emission shape.

Historically, the observations needed to study young stars have been corrected with different observatories by different groups.

The public survey ULLYSES (https://ullyses.stsci.edu/index.html) started from the Director of the Hubble Space Telescope (HST) is changing this idea. This survey of high-mass stars and of 82 low-mass ($M_\star \lesssim 2 M_\odot$) young (age$<$10 Myr) stars at UV wavelengths release immediately the data taken.

As a community, we have grouped together to get the best out of this incredible dataset. On top of an open collaboration, ODYSSEUS (https://sites.bu.edu/odysseus/), different public efforts are being carried out to complement the ULLYSES dataset with other spectra and photometric data. Among others, the large program PENELLOPE of 250 hours on the Very Large Telescope (VLT) is providing public data to the community. The reduced data are made publicly available shortly after on ZEnodo (https://zenodo.org/communities/odysseus/), and will be available on the Phase 3 ESO pages.

Here I will present this community effort, and highlight the advantage of collaborating on public data to advance in our understanding of our questions.