The Peer Community in (PCI) project offers an alternative to the current system of publication - which is particularly expensive and not very transparent. It is a non-profit scientific organization that aims to create specific communities of researchers reviewing and recommending, for free, unpublished preprints in their field (i.e. unpublished articles deposited on open online archives like arXiv.org and bioRxiv.org). Each PCI is a group of several hundred recommenders playing the role of editors who recommend such preprints based on peer-reviews to make them complete, reliable and citable articles, without the need for publication in ‘traditional’ journals (although authors can submit their recommended preprints afterwards). Evaluations and recommendations by a PCI are free of charge. The first Peer Community in was launched in 2017: Peer Community in Evolutionary Biology (PCI Evol Biol). More than 1000 recommenders have already joined PCI Evol Biol, PCI Paleontology, PCI Ecology, PCI Animal Science, PCI Zoology, PCI Mathematical and Computational Biology, PCI Archaeology, etc.