Harshlands is the only other RPI that I know of besides the two you mentioned. Maybe you mean RP enforced mud? There are plenty of them. (RPI is a more strict term)
Harshlands is similar to SoI codewise (but with less advanced code in my opinion) but has a completely different setting (including a LOT more religious influences) and a lot less players.
If you want a PK mud, Carrion Fields isn't an RPI but it is RP enforced and focuses very heavily on PK.
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