I am part of the team maintaining aspell & hunspell tamil .dic & .affx files. We have our files here: https://github.com/thamizha/solthiruthi
We regularly update the firefox extension and trying to get the latest files updated in other projects like chrome.
In many linux distros we find our old dictionary file that were part of aspell (which we submited in 2004) were still being used. We could not find a central place to maintain tamil dictinary files, from where various other projects can pick it up.
I suggest you create a folder for dictionary files in hunspell project file section for us to update those files. This will help various language projects very much.
I have attached the latest .dic & .affx files for tamil language