PS4 hack: The latest status for 5.50, 5.05 (and below) - updates from Qwertyoruiop - Wololo.net
PS4 exploits: the status for 5.5x owners (5.50, 5.53, 5.55) - Wololo.net
GitHub - satel0000/PS4-5.xx-WebKit-Exploit-PoC: PS4-5.xx-WebKit-Exploit that allows you to dump libkernel and libSceWebKit2. Originally forked from ALEXZZZ9.
PS4 Exploit Guide | Page 1121 | GBAtemp.net - The Independent Video Game Community
PS4 Exploit: 5.05 Webkit exploit released, 4.55 functional Jailbreak probably only a matter of days - Wololo.net