Re:Horcrux: A Password Manager for Paranoids
by hdhzy on Monday June 19, 2017 @04:21PM
(#14590122)
NEO has open source OpenPGP applet (in contrast of 4) but if you read the link carefully they provide rather strong points why it doesn't matter and closed hardware can even be more secure.
https://www.yubico.com/2016/05/secure-hardware-vs-open-sourc...