IBM SystemT
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IBM SystemT is a declarative information extraction system built as a research project at IBM's IBM Almaden Research Center beginning in 2005. Its name is partially inspired by System R, a seminal project from the same research center.
SystemT includes the following three main components: (1) AQL, a declarative rule language with similar syntax as SQL; (2) Optimizer, which takes AQL statements as input and generates high-performance algebraic execution plans; and (3) Execute engine, which executes the plan generated by the Optimizer and performs information extraction over input documents.
SystemT has been taught in multiple universities around the globe and as online courses since late September 2016.