LTTE Liberation Tigers of Tamil Eelam - was the only remaining armed Tamil nationalist group, after successfully liquidating other groups. LTTE was defeated militarily by the Sri Lankan armed forces in May 2009. The leader was V. Prabakaran.
EPRLF Eelam People's Revolutionary Liberation Front - a part of the TNA.The leader was K.Padmanaba
EPDP Eelam People's Democratic Party - pro-government group and a political party accused of being a paramilitary The leader is Douglas Devananda 
TELO Tamil Eelam Liberation Organization -once decimated by the LTTE, part of TNA The leader was Sri Sabaratnam
PLOTE People's Liberation Organisation of Tamil Eelam - a minor standalone political party accused of being a paramilitary; the PLOTE, unlike other groups, vehemently denies this. The leader was Uma Maheswaran
ENDLF Eelam National Democratic Liberation Front - created with the help of the IPKF, now active in India in refugee settlements in Orissa. The leader was Paranthan Rajan
EROS Eelam Revolutionary Organisation of Students - largely active in the 1970s and 1980s.The leader was V.balakumar
TMVP - a LTTE splinter group, a pro-government group accused of being a para-military organization
NLFT – National Liberation Front of Tamileelam, which according to Taraki, was a small but influential Maoist group based largely in Jaffna, which "drove down the road to perdition by splitting hairs over the question of whether it should first build an armed wing or a mass political movement."
PLFT – People's Liberation Front of Tamil Eelam, a splinter group of NLFTE.
PLA – People's Liberation Army, the military wing of EPRLF, Led by current EPDP leader Douglas Devananda. Important achievement of the PLA was the 1984 kidnapping of American couple Stanley and Mary Allen from Columbus, Ohio, in Jaffna.
^ abThe Morning Leader. "TNA undecided as to what to do in the East". Retrieved 2008-05-21. "The Tamil National Alliance (TNA) is yet to arrive at a final decision on the recent developments in the east following notices issued by the Karuna Group last week," TNA Batticaloa Parliamentarian K. Thangeswari said. The notice, which was said to have been issued by ‘Senan Padai,’ has urged the people in the east to support no other political party in the east but the Tamil Makkal Viduthalai Pulikal (TMVP)."