I'm trying to locate an open source business rules engine that has a decent interface for building the rules.
OR at least one that works well on the .Net platform and has been updated sometime in the past 12 months.
Thanks,
NxBRE is one option.
You can use Reaction RuleML. The Rule Manager from Acumen Business has an adapter for business users to generate a valid RuleML document
I'm going to throw one more piece of software I ran across: ncalc.
It's not exactly a "rules" engine; but it does do dynamic calculations where you can give it the expression to evaluate and all of the variables necessary. This was pretty much exactly all I needed for the app I was working on.
For a simple engine it works just fine. As far as an interface, it wasn't that complicated to build a few pages to let people type in the expressions.
For more complicated things, NxBRE is a better option; as @Kevin Dente answered above.
来源：https://stackoverflow.com/questions/21766/open-source-rules-engine-with-decent-interface-for-writing-rules