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Rego, the language used in Open Policy Agent, is based on and extends Datalog. It's gaining a lot of traction in the past couple of years for evaluating authorization policies.

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There's an indirect relationship between Rego and DDlog, at least people-wise. OPA comes from Styra, which was founded by Tim Hinrichs and Teemu Koponen. Teemu designed nlog, which is also a Datalog variant, for use in NVP, which was the network virtualization product at Nicira and was later renamed NSX after VMware acquired Nicira. Tim also worked with Teemu (and me) on NSX at VMware. And Teemu was one of the architects of OVN (the biggest open source application for DDlog), with Tim also having some influence. And Teemu also knows Leonid and Mihai (the principal authors of DDlog).

Some of the episodes of my OVS Orbit podcast may be relevant:

* Episode 5: nlog, with Teemu Koponen from Styra and Yusheng Wang from VMware (https://ovsorbit.org/#e5)

* Episode 44: Cocoon-2, with Leonid Ryzhyk from VMware Research (https://ovsorbit.org/#e44)

* Episode 58: Toward Leaner, Faster ovn-northd, with Leonid Ryzhyk from VMware Research Group (https://ovsorbit.org/#e58)

Ozo[1] is another authorization language, but based on Prolog. It'd be interesting to compare the capabilities between the two.

[1] https://www.osohq.com

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