Yadlr is a toolset for many-valued inference, both deductive and inductive. It features a fuzzy reasoner, using CLP(Q,R) to implement fuzzy algebra on top of a resolution-based back-end. It also features Prodlr, an ILP system targeted at learning Description Logics and threaded-variable theories, like DCGs.
OO jDREW is an open source deductive reasoning engine for the RuleML web rule language. OO jDREW implements the object oriented extensions to RuleML which include: Order Sorted Types, Slots, and Object identifiers.
jDREW (Java Deductive Reasoning Engine for the Web) is a highly configurable reasoning engine written in Java for definite clause reasoning. Through its diverse APIs, jDREW can be easily embedded into a larger Java system.
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Auth0's B2B Essentials plan gives you everything you need to ship secure multi-tenant apps. Unlimited orgs, enterprise SSO, RBAC, audit log streaming, and higher auth and API limits included. Add on M2M tokens, enterprise MFA, or additional SSO connections as you scale.
Cigol (logic, spelled backwards) is a deductive logic solver. It can be embedded inside a parent program or used from the command line. It has absolutely no relationship to Tom Mitchell's book on Machine Learning.