From the PeerJ Blog:
PeerJ has been publishing PeerJ PrePrints (an innovative pre-print server for un-peer reviewed articles in the biological, health and medical sciences) since April 2013. In that time, we are pleased to have published almost 100 preprints, some of which have received more than 5,000 views. Some preprints have been revised several times, and some have gone on to be published as formal peer-reviewed articles in PeerJ.
Until now we had allowed authors to publish one free preprint per year (without needing to purchase a ‘paid’ publication plan), however we appreciate that this artificially limits the ability of some authors to submit tir preprints to us. One of our core beliefs is that we are working to maximize the ability of all authors to publish their work as freely as possible, and so we are pleased to announce today that we are lifting the ‘one free preprint per year’ restriction. Henceforth anyone will be allowed to publish as many PeerJ PrePrints as they wish, without needing to take out a paid publication plan.
Read the Complete Blog Post
See Also: PeerJ Infographic