MetricKnn
Fast Similarity Search using the Metric Space Approach
...The intended users are software developers, academics, students and data scientist who need to efficiently compare objects according to some criteria.
MetricKnn is an open source project released under the BSD 2-Clause License. The source code is available in GitHub https://github.com/juanbarrios/metricknn.
For more information please visit the project's homepage: http://metricknn.org/