Nikhil Ketkar

Here is a list, but need to explore further. I am not sure how this works if the distance measure is bad.

1. Dunn’s Index
2. Davies-Boldin’s Index
3. Partition Coefficient
4. Classification Entropy
5. Seperation Index
6. Fuzzy Hypervolume
7. CS Index
8. Calinsky-Harbnasz Index
9. I-Index

A good reference is A new index of cluster validity. Also look at Performance evaluation of some Clustering Algorithms and Validity Indices and A new cluster validity index for the fuzzy c-mean