Welcome to the community As @Balvis has correctly pointed out above, we are TamilNadu chapter for Free Software Movement of India (http://fsmi.in/#member-organisations). FSMI has presence in various states of India through it's local chapters. One such chapter here in Tamilnadu is FSFTN. GLUGs (GNU/Linux Users Group) are the fundamental units of FSFTN.
Even though named as GLUGs, GLUGs focus is not restricted to just GNU/Linux alone but the entire ecosystem of Free Software and it's principles.
On top of it today as a organization FSMI itself has recognized that the challenge in defending user's freedom in digital realm is not only about using Free Software but also about putting up a huge resistance towards data commodification, privacy violation, mass surveillance, censorship, etc.,
As a result of which various other ideas to build and experiment alternatives have evolved like Mesh-networks and other commons related initiatives.
Take your time, browse through our forum and website and jump in wherever you seem you fit and have interest to contribute to. Once again welcome back