I am Chenthil Nathan, blogging at http://chenthil.blogspot.com for past thirteen years. I fancy myself as a bi-linguist.
Tamil has a rich poetic tradition dating back to 3rd Century BC. Old Tamil poetry follows strict rules laid out in TholKappiyam, the oldest extant grammar treatise in Tamil. You can read more about Tamil literary tradition here https://en.wikipedia.org/wiki/Tamil_literature
This blog has my translations of Old Tamil Poetry. I post tweets at http://twitter.com/oldtamilpoetry and use this site as a repository.
There are many translations and attempts to translate these works in Tamil. Currently Vaidehi Herbert at http://learnsangamtamil.com/ is translating the entire works. http://twitter.com/kurunthokai is translating Kurunthokai with illustratons. Palaniappan Vairam at http://karkanirka.org blog is translating Sangam and post Sangam tamil poetry on and off.
I plan to translate the poems that catch my fancy. There is no structured effort. I use the original text from Tamil Virtual Academy website http://tamilvu.org/library/libindex.htm . Translations are based on various commentaries published across centuries.