Where to find a reliable K-medoid(Not k-means) open source software/tool?

1. A k-medoid implmentation in C is available in the C Clustering Library (source, Manual). (note that Cluster 3.0 is an extension of this library, and may not provide k-medoids)

   From the manual:

   In the C Clustering Library, three partitioning algorithms are available: • k-means clustering • k-medians clustering • k-medoids clustering

2. k-medoids in mlpy, Machine Learning library in Python

3. k-medoids in Matlab

4. k-medoids in Java

5. k-medoids in C++

Software:

• ELKI includes several k-means variants, including K-medoids and PAM.
• GNU R includes on the "flexclust" package variants of k-means and on the "cluster" package.

Source: http://en.wikipedia.org/wiki/K-medoids