FRIL is FREE open source tool that enables fast and easy record linkage. Users may systematically and iteratively explore the optimal combination of parameter values to enhance linking performance and accuracy.
Great tool for quickly linking records. Works nicely and performs well. Installation was great...
I've been using FRIL to link public health data for a couple years now. The developer has always been very responsive. It is by far the most user friendly and configurable linkage software that I have ever used. The interface is state-of-the-art in terms of allowing the user to see how configuration choices affect the results. Oh, and it is really fast!