Josh Siegle and Jakob Voigts (the co-founders of Open Ephys), along with Jon Newman (developer of NeuroRighter, Puggle, and Cyclops) and Greg Hale (developer of ArtE), have written an opinion piece describing the past, present, and future of open-source hardware for multichannel electrophysiology. The article, titled "Neural ensemble communities: open-source approaches to hardware for large-scale electrophysiology," will appear in a special issue of Current Opinion in Neurobiology on large-scale recording technology, edited by Francesco Battaglia and Mark Schnitzer.
If you don't have access to the article and would like a copy, send an email info@open-ephys.org.