If you're interested in "plug-n-play" supplemental material surrounding the Victorian era, I'd also humbly suggest our Imperial Age line of Victorian products. They were written with d20 Modern in mind, but are modular enough that they'd be easily adaptable to True20.
(We're also producing a supplement on Victorian heroes for Mutants & Masterminds, called Gaslight Guardians, under the Superlink license....but that's not out until December.)
(We're also producing a supplement on Victorian heroes for Mutants & Masterminds, called Gaslight Guardians, under the Superlink license....but that's not out until December.)