PS4 Playground 1.50b Port, PlayStation 4 developer zecoxao with help from VVildCard777 added PlayStation 4 Webkit Playground 1.52 and 1.60 Firmware ports to Github today for those seeking to examine pre-2.00 OFW versions before Sony ramped up the security.
Download: playground-1.52-master.zip / 1.52 GIT / playground-1.60-master.zip / 1.60 GIT / PS4 Playground Live Demo / Websploit.org (Mirror)
Another PS4 Github update comes from shakugan who recently shared a WIP called PS4Misc by esc0rtd3w for those seeking to run things outside the PlayStation 4 browser.
Currently their PlayStation 4 Playground WebKit exploit forks include support for PS4 firmware 1.76 / 1.60 / 1.52 / 1.50b / 1.01 only at the moment.
As @zecoxao notes below, to quote: 1.51 playground is not possible at the moment (missing a gadget that is not on main modules) and 1.61 playground is the exact same as 1.60.
And from the PS4Misc README.md file, to quote: if u want to run stuff outside the browser:
place a loader in /data/rcved
cd function_hook make ./run.sh cd shellcore_inject make ./run.sh press home and do something like opening a non-granted pkg
at this point the 2nd loader should be running
rerun the kernel hooks outside the browser cd function_hook ./stage2.sh
Cheers to both @Bultra and @oneman123 in the PSXHAX Shoutbox for the news earlier today on these PS4 scene updates.