There’s a forked version of the OS called Omega that’s really nice: https://github.com/Omega-Numworks/Omega
And apparently a jailbreak for Epsilon 16+: https://phi.getomega.dev/
And apparently a jailbreak for Epsilon 16+: https://phi.getomega.dev/
(it's a port/adaptation of https://en.wikipedia.org/wiki/Xcas )