I'm interested in the process of testing or validating a particular implementation of a statistical method, and what datasets and/or published analysis exist that could be used to do this in practice.
For instance, if I write an algorithm to implement a simple linear regression, I might feed in some numbers and check the result looks good, or I might feed numbers into my code and some other system and compare. In some cases, people seem to have already done this and then publish the numbers and results which could be defined as reference data.
To start off, the best one I know is the NIST Statistical Reference Datasets page that publishes a wide range of datasets and calculations that covers areas such as Analysis of Variance, Linaear Regression, Markov Chain and Monte Carlo simulation and Non-Linear regression.
Are there any other good / notable ones out there.
Edit: I reworded to make clear that I'm not just looking for open datasets, but I'm interested in datasets and solutions to specific statistical problems that could be used to test an implementation of a technique.